Top 10 Phone Number Validation Tools of 2026

• 1,649,702 phone numbers were validated on 1Lookup between 13 September and 12 October 2026: 81.5% came back mobile, 15.4% landline and 2.3% VoIP.
• 15.4% landlines is about 3 in every 20 numbers that can't receive a text or a ringless voicemail at all.
• 5.2% of the same numbers were invalid or unreachable: about 1 in 19 dials that would have gone nowhere.
• Up to $500 per call, or up to $1,500 when willful: what the TCPA lets a person on the Do Not Call Registry claim after more than one unwanted call in 12 months.

Our pick for outbound teams adding phone steps

1. 1Lookup

1Lookup is where we would start if your cadence adds calls, texts or voicemail drops after email. One check returns the five fields an outbound team acts on, the price per check is printed on each product page, and the same credits cover the Do Not Call and litigator scrub you want before anyone dials.

• The phone validation API returns whether the number is reachable, its current carrier with porting history, its line type (mobile, landline or VoIP), Do Not Call and Do Not Originate flags, and a low, medium or high risk level.
• 1 credit per check: about $4.95 per 1,000 numbers on the Starter plan, and $3.52 on Growth.
• An HLR lookup asks the mobile network whether a number is live right now, for 5 credits (about $24.75 per 1,000 on Starter), and a number the network reports as invalid is not charged.
• The phone scrub checks the National Do Not Call Registry, state lists where available and known TCPA litigators, and costs nothing when a number matches no list.
• Check one number by API or a whole CSV from the dashboard, or try the free phone number lookup with no signup. Plans start with a 7-day free trial, and Starter is $99 a month for 20,000 credits.

Best for: Outbound teams that call, text or drop voicemails after email and want validation, live status and DNC scrubbing on one bill.

Best for developers already sending on Twilio

2. Twilio Lookup

Twilio Lookup is the phone data API inside Twilio's messaging platform. Formatting and basic validation are free, and each deeper signal is a paid package you request per number, so you pay only for the fields you ask for.

• Line type intelligence returns the carrier and the kind of line (mobile, landline, fixed or non-fixed VoIP, toll-free and more) for $0.008 a request.
• Line status says whether a number is active or reachable, from $0.007 a query on its first volume tier.
• Pay as you go with a free trial and no credit card, but every signal is a separate fee on the same number.

Best for: Engineering teams that already send texts or calls through Twilio.

Best for lookups, risk scores and one-time codes from one vendor

3. Telesign

Telesign sells phone number and subscriber data alongside fraud scoring, SMS and voice verification. Its Phone ID API is the lookup piece, and the same account can send the one-time codes a signup form uses.

• Phone ID returns phone number and subscriber attributes, billed per transaction, with volume pricing through sales.
• Pay as you go, with no contracts, time commitments or monthly fees.
• A free trial account comes with test credits that cover Phone ID, Phone ID Contact and its Intelligence risk scoring.

Best for: Companies that want phone lookups, risk scores and verification codes from one vendor.

Best for apps already built on Vonage

4. Vonage Number Insight

Vonage's Number Insight API checks a number's format and its original and current carrier, and adds reachability on its Advanced tier in some markets. Formatting is free, and each carrier lookup is its own small charge.

• Its pricing page lists the current carrier at $0.00819 a request and the original carrier at $0.00117, with number formatting at no cost.
• SIM swap and subscriber match are priced by country, and new accounts start with free credit and no credit card.
• Vonage will sunset Number Insights on February 4, 2027 and points users to its Identity Insights API, so a new build should start there.

Best for: Developers who already send messages or verification codes through Vonage.

Best for basic format checks at low volume

5. Numverify

Numverify is a simple REST API that checks a number's format and returns its carrier, line type and location from numbering-plan data in 232 countries and territories.

• A free plan of 100 requests a month, for non-commercial use and without support.
• Paid plans start at $14.99 a month for 5,000 requests.
• Its pricing page advertises no live check of whether a number is still in service.

Best for: Side projects and small tools that check a handful of numbers a month.

Best large free monthly allowance

6. Veriphone

Veriphone validates numbers in 243 countries and territories and returns the carrier and line type, by CSV upload or API, with a free allowance of 1,000 credits every month.

• 1,000 free credits a month, with no credit card.
• Credit packs start at $24 for 10,000 and never expire; the Starter subscription is $12.99 a month for 10,000 credits that reset monthly.
• A standard check uses 1 credit, and finding the carrier a number is on today (its Current Carrier Lookup) uses 10.

Best for: Teams validating modest lists who want to stay inside a free monthly allowance.

Best for a phone field check on a signup form

7. Abstract API

Abstract runs a family of small APIs, and its phone validation API returns whether a number is valid, its carrier, its line type and where it is registered.

• A free tier of 100 phone requests a month.
• Email, phone and IP lookups are separate APIs, each on its own meter and its own line of the bill.
• Plans differ by the data each response carries: Starter returns the core validation fields, and higher plans add enrichment and risk signals.

Best for: Product teams adding a phone check to a signup or lead form.

Best for a connected or disconnected answer

8. RealPhoneValidation

RealPhoneValidation checks whether a number is connected, with its line type and carrier, and adds a Do Not Call check that goes beyond the national registry.

• Its validator flags disconnected and unreachable numbers before you pay for a call or a text.
• The DNC check covers the national, state and DMA lists and says whether a number is tied to a known litigator.
• The first 100 validations are free for qualified businesses, with no credit card; after that it is pay as you go, or prepaid volume pricing by quote.

Best for: Call centers that want a connected status on every number they dial.

Best for pay-as-you-go line type checks

9. Landline Remover

Landline Remover does one job: it returns each number's line type and carrier, so texting and voicemail-drop lists only carry numbers that can receive them.

• $0.0020 per number check (10,000 checks for $20), and $0.0019 at 100,000 credits or more.
• Every check includes a Do Not Call type and a litigator flag at no extra cost.
• No subscription or monthly minimum, credits never expire, and 10 free credits to start with no credit card.

Best for: Teams cleaning SMS and voicemail-drop lists on a tight budget.

Best for phone checks next to people search

10. Searchbug

Searchbug is a people-search and data API company, and its phone APIs return line type, carrier, whether a number is active or disconnected, and its Do Not Call status.

• A separate API checks the FCC Reassigned Numbers Database, to tell you whether a number has changed hands.
• One number at a time, a bulk API request of hundreds or thousands, or a file upload.
• A prepaid balance of $10 to $5,000, charged per successful query; a one-year plan at a fixed rate has a $2,400 minimum annual commitment.

Best for: Teams that already buy people-search or skip-tracing data and want phone checks on the same balance.