---
title: "Is a Phone Number Still Active? HLR Lookup Guide"
description: "Valid, assigned, reachable, right person: what validation, HLR lookups and line type checks tell you, what only the call reveals, and when to check first."
url: https://skipcall.io/en/blog/is-a-phone-number-still-active
language: en
last_updated: 2026-11-06
---
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Published 6 November 2026

# Is This Phone Number Still Active? What You Can Check Before Dialing, and What Only the Call Reveals

Valid, assigned, reachable, right person: the four levels of a phone number. What validation, an HLR lookup and line type intelligence really tell you, what only the call reveals, when checking before you dial pays off, and how to claim credits back from your data provider.

Every prospecting list contains numbers that lead nowhere. Some never existed, some were disconnected, and some now ring a stranger. “Is this number still active?” sounds like one question; it is really four, and no single tool answers all of them. A validator tells you whether the number is well formed. A network lookup tells you whether a mobile number is assigned and switched on. Only the call tells you whether the person on the line is the one you want. This guide separates what you can check before dialing from what only the call reveals, puts a price on each option, and shows how to turn every dead number into a credit from your data provider.

## Valid, assigned, reachable, right person: the four levels

When a rep says “this number doesn’t work”, they can mean four very different things. Telling them apart comes first, because each level is checked with a different tool, at a different cost, and one of them cannot be checked before the call at all.

**Valid.** The number fits its country’s numbering plan: right number of digits, an area code or prefix that is actually in use, a consistent line type. A ten-digit North American number with a real area code is valid; a nine-digit one is not. This level is free to check, offline, in a fraction of a second.

**Assigned.** A carrier has given this number to a subscriber, and the subscription is live. A valid number may never have been assigned, or may have been disconnected. For a mobile, the carrier knows and can answer a network query; for a landline, that information is much harder to reach.

**Reachable.** The handset is on and connected to the network right now. An assigned mobile that is switched off, in airplane mode or out of coverage is not reachable. This level changes by the hour: “unreachable” in the morning can pick up in the afternoon.

**Right person.** The person who answers is the prospect you are after. It is the only level that matters to a rep, and the only one no technical check can guarantee: a reassigned number is valid, assigned and reachable, but it rings someone else.

The table below sums up, for each level, what checks it and what it misses.

| Level | What checks it | Typical cost | What it misses |
| - | - | - | - |
| Valid shape of the number | A validator built on the numbering plan (libphonenumber) | Free | Anything about the subscription |
| Assigned live subscription | HLR lookup or a line status service, mobiles only | Under a cent per number | Landlines, part of VoIP, some networks |
| Reachable handset switched on | The same query, at the moment it runs | Same | The next hour: the state changes during the day |
| Right person it is your prospect | The call itself | Rep time | Nothing: it is the only test that settles it |

The rest of this guide follows that order: what you can check without calling, what only the call reveals, then when one beats the other.

## What you can check without calling

Before spending anything, three free or nearly free checks remove a good share of unusable numbers. A fourth, paid, queries the mobile network. Here they are in the order that makes sense to run them.

1. 01

   #### Repair and validate the format:

   a number damaged by Excel (lost leading zero or plus sign, scientific notation, extension glued on) looks invalid when it is fine. Our [phone number validator](https://skipcall.io/en/tools/phone-number-validator) repairs those defects, formats every number in E.164 and flags those that break the numbering plan. It says so itself: validation is about the format, not the subscription.

2. 02

   #### Remove duplicates and shared numbers:

   the same number on several contacts at one company is almost always the switchboard. It is not a dead number, but it is not a line that reaches a person either. The [CSV cleaner](https://skipcall.io/en/tools/csv-cleaner) merges duplicates; the [direct dial checker](https://skipcall.io/en/tools/direct-dial-checker) sorts every number into mobile, direct dial or switchboard.

3. 03

   #### Read the line type:

   in the UK, mobiles start with 07; in Germany with 015, 016 or 017; in France with 06 or 07. Toll-free and premium numbers are reception lines. In the US and Canada, mobiles and landlines share the same area codes, so the line type can only be read with a carrier lookup.

4. 04

   #### Query the network for mobiles:

   an HLR lookup, or a line status service, asks the network whether the number is assigned and whether the handset is on. It is the only pre-call check that touches the subscription. It is paid, limited to mobiles, and covered in detail in the next section.

## HLR lookups: what they tell you, and what they don’t

The HLR (Home Location Register) is the database where each mobile carrier records its subscribers: which number maps to which SIM card, where the handset is registered, whether it is switched on. Specialist providers query these databases on their customers’ behalf. Twilio, for instance, offers two paid checks in its Lookup service, on top of free basic validation.

$0.007

per number for Twilio's Line Status, drawn from the HLR (checked on November 6, 2026)

$0.008

per number for line type and carrier identification (Line Type Intelligence)

Free

for basic validation and formatting from the same provider

Twilio’s Line Status, which went to public beta on July 14, 2026 according to Twilio’s announcement, returns one of five statuses. Reading them takes some care, because “active” does not mean “reachable”.

| Status returned | What it means | What to do with the number |
| - | - | - |
| Reachable handset connected | Number assigned, handset connected to the network right now | Call first, ideally within the hour |
| Active live on the network | Number assigned and in service, reachability not confirmed | Call as usual |
| Unreachable handset off | Number assigned, handset switched off or out of coverage | Keep it; try again at another time of day |
| Inactive not assigned | Number assigned to no subscriber, or invalid | Remove it and report it to the provider |
| Unknown no answer from the network | The carrier queried did not respond | Draw no conclusion; call it |

The check has hard limits worth knowing before you pay for thousands of queries.

**Landlines are not covered.** The HLR is a database of mobile subscribers. A direct dial landline or a switchboard is not in it: the check will return a line type, not a subscription status.

**Not every network answers.** Twilio itself warns that Line Status may not return data for some networks and recommends testing coverage for the country you target. “Unknown” is not a dead number.

**Porting blurs the carrier.** A number ported to another carrier can still show its original carrier in a basic HLR response. To know the current carrier, you need a query against number portability data.

**No name, no identity.** The HLR holds no subscriber name. It cannot tell you whether the number still belongs to your prospect, nor whether it is on a do-not-call list.

> An HLR lookup tells you a phone exists and is switched on. It never tells you who owns it.

VoIP numbers are a special case. A cloud phone number handed to an employee is not a mobile subscriber; a line type check flags it as VoIP (fixed or non-fixed) without being able to say whether anyone still watches that line. Our guide to [direct dials, mobiles and switchboards](https://skipcall.io/en/blog/direct-dial-vs-mobile-vs-switchboard) explains how those numbers behave on the phone.

Line type intelligence deserves a word of its own, because it is the check most teams actually need. Twilio’s version returns the carrier and one of several line types: mobile, landline, fixed VoIP, non-fixed VoIP, toll free and a few others. That answer matters most in the US and Canada, where the number itself says nothing about the line. A non-fixed VoIP number, the kind anyone can create online in minutes, is a weak lead for a B2B call; a fixed VoIP number tied to a company phone system often behaves like a direct dial. Knowing the split before a session tells you how many real mobiles you have, which is the figure that drives your connect rate.

Two practical details shape how you run these checks. First, each request covers one number, so checking a list means looping through it, ideally in the same workflow that imports the list into your CRM, not as a separate project nobody owns. Second, a status is a snapshot. “Reachable” at 9 a.m. says nothing about 3 p.m., and “inactive” on a number that was being ported can flip back a few days later. Run the check close to the session that will use it, store the result with its date, and never treat an old status as a fact about today.

## The costliest trap: reassigned numbers

A disconnected number does not stay empty forever. Carriers recycle numbers and hand them to new customers after an aging period. In the US, the Federal Communications Commission set up a Reassigned Numbers Database for exactly this problem: callers can ask whether a number has been permanently disconnected since a given date, before they dial it.

For a rep, the consequence is simple: a mobile number found a year ago may now ring someone who has never heard of your prospect. The number is valid, assigned and reachable; it passes every technical check. Only the call reveals it, and it reveals it badly: the person who answers is annoyed, and your caller ID risks being reported as spam.

Job changes make it worse. A prospect who leaves a company often keeps their personal cell phone but hands back their company phone, which may be reissued to a colleague. The same number, still active, now reaches someone else at the same company, which is even easier to miss.

## How fast phone numbers go bad

The figures that circulate on B2B data decay are rarely what they claim to be. Before you check a list, you need to know what to expect, and that means sorting the sources.

| Figure | Source | What it really measures |
| - | - | - |
| 4.1 years median tenure with the current employer | Bureau of Labor Statistics, January 2026 | How fast people change jobs: 20.6% of wage and salary workers had a year or less of tenure |
| 22.5% a year often quoted for B2B | HubSpot, citing MarketingSherpa (2.1% a month) | Decay of email marketing databases, not phone numbers |
| 25 to 30% a year prospecting files | Dropcontact | An estimate with no published method |
| 5 to 10% / 15 to 20% mobiles / direct dials, per year | Prospeo | A vendor table with no stated source |

The only solid figure on that list is the BLS one, and it does not measure phone numbers directly: it measures how fast people change jobs. A personal cell phone often survives a job change; a direct dial never does. That is why a list’s decay depends mostly on its share of direct dials and switchboards, and on the seniority of the roles it targets. Our [B2B data decay calculator](https://skipcall.io/en/tools/b2b-data-decay-calculator) starts from that data and estimates, for your list, the share of numbers that have probably gone bad and the date to refresh it.

## What only the call reveals

The call is still the most complete test: it goes through all four levels at once. You still need to read what it sends back. Each outcome says something different about the number, and deserves a different label in your tools.

**The intercept message.** In North America, three rising tones followed by a recording that the number is disconnected or not in service; elsewhere, a carrier announcement to the same effect. It usually plays before any ring. It is the only direct proof of a dead number, so log it precisely: it is your evidence with the provider.

**No answer, ringing out.** The number is assigned, the phone rings, nobody picks up. It is not a dead number: try another time slot, in the prospect’s local time, before you conclude anything.

**Voicemail.** It confirms the line is live, and the greeting often says whose line it is. A first name on the greeting that differs from your prospect’s is a strong sign of a reassigned number or a wrong contact.

**The wrong person.** Someone answers who is not your prospect. It can be a colleague (line reissued), a stranger (number reassigned) or reception (switchboard labeled as a direct dial). Each case calls for a different action on the record.

**The switchboard or phone tree.** The line is alive, but it routes calls. It is not a wrong number, it is a mislabeled one: move it to a separate gatekeeper list rather than deleting it.

**The screened call.** On iPhone and on many Android phones, an unknown call can be intercepted by call screening or labeled as suspected spam. The line is active; your caller ID is the problem. Our guide to [a caller ID marked as spam](https://skipcall.io/en/blog/caller-id-marked-spam) shows how to diagnose it.

Why a correctly identified prospect does not pick up (time slot, screening, distrust of unknown numbers) is a different topic, covered in our article on [why prospects don’t answer cold calls](https://skipcall.io/en/blog/why-prospects-dont-answer-cold-calls). Here the question is narrower: is the number itself right?

| Call outcome | Share of calls |
| - | - |
| Voicemail | 70.8% |
| No answer or busy | 7.3% |
| Technical failure | 2.8% |
| Number in error (not assigned or invalid) | 0.8% |
| Picked up, conversation over 30 seconds | 11.0% |
| Picked up, 30 seconds or less | 6.8% |
| Other | 0.4% |

The wrong person does not show up in technical statuses, only in what reps log. In this sample, the “wrong number” tag (someone else picks up) covers 7.2% of pickups, or 1.3% of calls; “wrong contact” and “no longer at the company” cover 14% of pickups. On a list of mobiles, no number was in error, but 4.8% of pickups were wrong numbers. A bad number is spotted less by a network error than by the person who answers. Some short pickups are in fact answering machines, hence the 30-second threshold for calling it a conversation.

## Log every outcome so each call pays twice

A call to a dead number costs time. Logged properly, it also pays something back: it cleans the list, it supports the credit request, it improves how you measure each provider. That takes precise call outcomes, not a catch-all “no answer”.

1. 01

   #### Create distinct outcomes:

   “not in service”, “wrong person”, “switchboard”, “no answer”, “voicemail”, “conversation”. The first three describe the quality of the number; the last three, the prospect’s availability. Mixing them makes measurement impossible.

2. 02

   #### Don't conclude on a single call:

   a number that does not answer once is not dead. Three attempts at different times, including one early morning and one late afternoon in the prospect’s local time, are usually enough to decide. Our [when to call tool](https://skipcall.io/en/tools/when-to-call) helps spread those attempts.

3. 03

   #### Keep the source of every number:

   record which provider, which export and which date each number came from. Without that column you cannot tell which provider sells you dead numbers, or claim a credit.

4. 04

   #### Push results back to the CRM:

   a “not in service” number must leave the record, a “wrong person” must be flagged and replaced. Otherwise the same dead number comes back in the next session, and in your colleagues’ sessions.

**Simple rule: declare a number dead only on evidence (intercept message, confirmed wrong person), never on silence.**

## When to check before dialing, and when to just call

Checking a list before calling it is not always worth it. It depends on three variables: list size, list age and how the list will be dialed. A dead number mostly costs rep time; a network lookup costs money and only covers mobiles.

| Situation | Check first? | Why |
| - | - | - |
| Fresh list, enriched this quarter a few hundred contacts | No | Few dead numbers; the call will find them, and the outcomes support the credit claim |
| List older than a year mostly mobiles | Yes, line status | The share of inactive numbers grows; the check costs less than the wasted time |
| Old list mostly direct dials | Refresh rather than check | HLR does not cover landlines; re-enrichment returns new numbers |
| High volume dialed by hand thousands of contacts | Yes, at least on mobiles | Every dead number costs full-price rep time |
| Volume dialed with a dialer power or parallel dialer | Rarely | The dialer absorbs dead numbers; check mainly lists older than a year |
| US list, autodialed mobiles TCPA exposure | Yes, against the Reassigned Numbers Database | A reassigned number can turn a sales call into a compliance problem |

The math also changes with the stakes. A reassigned number that now rings a consumer is not just wasted time: it exposes your caller ID to spam reports, and in the US it raises a compliance question, covered below. On old lists, freshness protects your caller reputation as much as your productivity.

## Claim your credits back from the provider

Most contact data providers do not charge for a search that finds nothing. That is the rule at Lusha, Apollo, Kaspr, FullEnrich, LeadMagic and Datagma according to their pricing pages (checked on November 6, 2026). A number that was found but turns out wrong is another matter: refund policies range from nothing at all to credits on request, and many are not published.

### Lusha

- **Search with no result** : Not charged
- **Wrong number** : No automatic refund; report it and Lusha may credit it back on request
- **Checked** : November 6, 2026, Lusha pricing and help pages

### Apollo.io

- **Search with no result** : Not charged; HQ numbers are free
- **Wrong number** : Mobile credits not refunded, including for numbers on a do-not-call list
- **Checked** : November 6, 2026, Apollo pricing page

### FullEnrich

- **Search with no result** : Not charged; a landline returned instead of a mobile is free
- **Wrong number** : Policy not published on the pricing page
- **Checked** : November 6, 2026, FullEnrich pricing page

### Kaspr

- **Search with no result** : No credit used when nothing is found
- **Wrong number** : Policy not published on the pricing page
- **Checked** : November 6, 2026, Kaspr pricing page

The full survey, provider by provider, is kept up to date in our [phone enrichment pricing comparison](https://skipcall.io/en/tools/phone-enrichment-pricing), which also turns each price into a cost per conversation. When a policy is not published, ask for it in writing before you buy.

To get a credit, the claim has to be precise and verifiable.

1. 01

   #### Gather the numbers concerned:

   an export of contacts with the outcome “not in service” or “wrong person”, the call date and the date the number was bought.

2. 02

   #### Attach the call log:

   the timestamp of each attempt and the logged outcome. A number called once with no answer proves nothing; an intercept message does.

3. 03

   #### Respect the window:

   providers that issue credits often set a window after purchase. Calling the numbers you buy in the following weeks, rather than storing them, protects that right.

4. 04

   #### Track the rate per provider:

   divide wrong numbers by numbers bought, provider by provider. It is the strongest argument to renegotiate, or to switch.

## The legal side of a number that is no longer the right one

A wrong number is not just a productivity problem. Under the GDPR, personal data must be accurate and, where necessary, kept up to date (Article 5). Calling a number you know has changed hands means processing inaccurate data and reaching someone who has nothing to do with your prospecting.

In the US, the stakes are sharper. Under the TCPA, calls made with an autodialer or a prerecorded message to a cell phone require prior express consent, and that rule does not stop at consumer numbers. If the number now belongs to someone who never consented, the call can create liability, which is why the Reassigned Numbers Database exists. Our guide to [cold calling cell phones](https://skipcall.io/en/blog/cold-calling-cell-phones) covers those rules, and the [cold calling compliance checker](https://skipcall.io/en/tools/cold-calling-compliance-checker) applies calling rules country by country.

## The mistakes that waste the most time

**Deleting on silence.** A number that does not answer is often a good number called at a bad time. Deleting it after one call destroys valid contacts and skews the provider’s wrong-number rate.

**Paying for HLR lookups on landlines.** The check does not cover landlines: on a list of direct dials, the money buys a line type you could often read from the number itself.

**Believing “active” means “right”.** An assigned, reachable number can belong to someone else. A network check cuts dead numbers; it does not cut wrong people.

**Storing numbers for months before calling.** Every month of waiting ages the list and can push numbers out of the provider’s credit window.

**Dropping the source column.** Without provider and date, you cannot tell where dead numbers come from, or get them refunded.

**Calling a flagged number again.** A “wrong person” outcome that never reaches the record comes back in a colleague’s session, who disturbs the same person a second time.

## How Skipcall fits this workflow

Skipcall is a phone system: it has no contact database and does not sell lists. Its built-in enrichment completes the contacts you already have, imported from a CSV file or synced from your CRM, so you can call them. During sessions, AI voicemail detection with prerecorded voicemail drop keeps reps from waiting on an answering machine, and every outcome is logged on the contact record, which gives you the basis for credit claims.

## The method in short

1. 01

   #### Repair, validate, deduplicate:

   free and immediate, with the validator and the CSV cleaner.

2. 02

   #### Sort mobile, direct dial, switchboard:

   to know which share of the list a network check can cover.

3. 03

   #### Estimate decay:

   from list age, industry and direct dial share; refresh rather than check when the list is old.

4. 04

   #### Check the mobiles on old lists:

   when they will be dialed by hand and in volume, and against the Reassigned Numbers Database for US autodialed mobiles.

5. 05

   #### Call, and log every outcome precisely:

   it is the only test of the right person.

6. 06

   #### Feed the results back:

   clean the CRM, claim credits, compare providers on their wrong-number rate.

To go further: our guide to [finding a cell phone number by name](https://skipcall.io/en/blog/find-cell-phone-number-by-name) explains where numbers come from, our article on [B2B phone number enrichment](https://skipcall.io/en/blog/b2b-phone-number-enrichment) details how to test a provider on 100 contacts, and our guide to the [burned prospect list](https://skipcall.io/en/blog/burned-prospect-list) covers the other way a list wears out: by being called too often. The [cold calling glossary](https://skipcall.io/en/academy/cold-calling-glossary) defines HLR, direct dial and switchboard.

Sources, checked in November 2026: Twilio, Lookup pricing page and Line Status documentation (public beta announced on July 14, 2026); public documentation from HLR lookup providers on the fields returned (assignment, porting, roaming, absent subscriber); FCC, Reassigned Numbers Database page and the April 2025 rate reduction; Bureau of Labor Statistics, Employee Tenure in 2026 (September 24, 2026); HubSpot, database decay page; Dropcontact; Prospeo; pricing pages of Lusha, Apollo, FullEnrich, Kaspr, LeadMagic and Datagma (checked on November 6, 2026); GDPR, Articles 5, 6 and 14; Telephone Consumer Protection Act. This is general information, not legal advice.

Author

[Charles Baldet](https://skipcall.io/en/author/charles-baldet) [Charles Baldet on LinkedIn](https://www.linkedin.com/in/charlesbaldet/)

CEO & Co-Founder, Skipcall

Charles is the CEO and co-founder of Skipcall. A sales commando with over 10 years of experience in B2B SaaS and complex strategic accounts, he has closed major deals with Stellantis, SNCF, RATP and Natixis. A specialist in the PUCCKA and MEDDIC methodologies, Charles regularly teaches sales at HEC's incubator and the Sorbonne. He was ranked among Les Echos' top 10 business angels under 35 in 2020. He also co-founded Getalead (B2B sales agency) and Getlab (SalesTech studio).

[See all their articles](https://skipcall.io/en/author/charles-baldet)

FAQ

## Frequently asked questions

**How can I tell if a phone number is still active without calling it?**

For a mobile number, a network query (an HLR lookup, or Twilio's Line Status) tells you whether the number is assigned to a subscriber and whether the handset is reachable right now. Twilio lists Line Status at $0.007 per number (checked on November 6, 2026). For a landline or a VoIP number there is no reliable equivalent: only a call confirms it.

**Does a valid number mean the line is active?**

No. A validator checks that a number fits its country's numbering plan: length, prefix, line type. It says nothing about the subscription. A perfectly valid number may have been disconnected, or reassigned to someone else.

**What is an HLR lookup?**

The HLR (Home Location Register) is the database where a mobile carrier records its subscribers. Querying it shows whether the number is assigned, whether it was ported to another carrier, whether it is roaming and whether the handset is on. It returns no name or address, and it does not work on landlines.

**What is a reassigned number, and why does it matter?**

When a subscriber gives up a number, the carrier eventually hands it to a new customer. A number you found a year ago may now ring a stranger. In the US, calling a reassigned mobile number without consent can create TCPA exposure; the FCC's Reassigned Numbers Database lets callers check whether a number was permanently disconnected since a given date.

**What should I do with a wrong number I bought from a data provider?**

Log the exact call outcome (not in service, wrong person), keep the call record as evidence and ask for a credit under the provider's policy. Policies range from nothing at all to credits on request: Lusha credits reported numbers on request, Apollo does not refund mobile credits (checked on November 6, 2026).

**Should I check every number before every campaign?**

No. A network lookup costs money and only covers mobiles; dialing a dead number costs rep time. Checking pays off on large, old lists dialed by hand. With a dialer that skips disconnected numbers without involving the rep, the threshold rises sharply.

## A calendar full of meetings starts with a call.

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Keep reading

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6 Nov 2026

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