Top 9 Best Phone Verification APIs & Alternatives (2021)

Developed by Telesign, the web-based API provides real-time personalized SMS based notifications, invitations, OTPs, and automated messages for websites or mobile apps. Based on REST architecture, the API uses HTTPS request methods to make calls. It supports CSV, XML, JSON and GeoJSON data transfer formats.

Its main features include sending customized texts, random validation codes, password reset, SMS delivery status reports, and voice authentication messages.

The API helps to reduce fraud due to the real-time authentications during new registrations and user activity on the integrated website. The API helps to authenticate user account details and transactions such as funds transfer, bill payments, or access to credit card details.

The API limits multiple creations of accounts by a single user and prevent fake accounts creation. The API provides automated voice messages with a global reach for users who wish not to receive text-based messages.

The API has four pricing models. The basic plan costs $1/month for 1000 credits, whereas the Pro tier goes for $10/month for 100000 credits. The Ultra package costs $50/month for 500000 credits. Finally, the Mega price is $250/month for 2.5 million daily credits.

Created by Veriphone, the internet-based API helps in verifying phone numbers, carriers, and region. The API checks a phone number against the country code provided. It returns the number, the line type, the carrier, and the region's validity status.

The API works for all countries and shows whether a number is valid, active, online, or offline.

When the country code is missing, the API checks the number based on its IP address. It returns the results in the international standard or local format. Details about a country, region, the number type such as mobile, toll-free, landline, and more, are displayed.

The API relies on REST architecture style and uses the standard HTTPS request methods to make a request. The Veriphone API responds in JSON payloads.

The API has four pricing plans. The basic tier is free to 1000 requests per month, while the Pro package costs $29/month for 50000 calls. The Ultra subscription costs $79/month for 250000 credits. The Mega price is $199 for 1 million calls per month.

Developed by Twilio the API allows clients to validate users’ phone detail by SMS, call or email. The API evaluates the quantity, type, and location of phone numbers needed to verify users.

The API can send messages globally with automatic language translation and compliance with international regulations. It is easy to integrate the API at sign up forms for fast and easy confirmation of user phone number. It is easy to scale verifications based on your need.

The API sends a verification code, usually a 4-10 digits number through SMS, phone, and email. Once the users input the correct match, the API approves the phone number.

To ensure data security, the API only allows for the upload of encrypted files. Also, for local integration, the API has a special server less SDK so that you can worry less about sensitive information.

Pricing starts at $10/month for the basic plan, $20/month for Pro, $50 for Ultra, and $200 for the Mega package.

The API uses two-factor authentication (2FA) authorization tailored for instant messaging apps such as telegram, Facebook messenger, and WhatsApp.

Users are directed to a chatbot on Messenger or Telegram. Once the user starts interactions with the bot, a one-time access code is issued. The user must then applies the code to the client's website within 50 seconds. After an exact match, the phone number of the user is verified.

The API is built on REST and returns responses in JSON data format. The API supports MongoDB, JavaScript, React, and Node.js programming languages.

The API is available for free.

Created by Interzoid, this web based API provides a number's country of origin, the region, city or rural number, the primary and second language of the location if available, the likelihood it is a mobile number, and the general wealth score of the area.

The API is designed for online traders to help in boosting sales. Its popular features include.

• Recognize if the number provided is for a mobile gadget
• Worldwide user experience
• Enhanced customization of international communication
• Marketing of commodities based on visitor's nationality
• Instant feedback

The API uses REST architectural style and delivers payloads in JSON data format.

The API has a free limited plan. Paid tiers are Pro at $10/month, Ultra at $100/month, and Mega at $1000/month.

The API allows its clients to send random SMS or voice call for verification. The API also checks the IMSI, reachability, original and current network operator. The API can determine whether the number is ported or mobile.

By default, the API sends a code via SMS. If there is no response, the API sends a voice message using text to speech (TTS).

The API works on the REST framework and supports programming languages such as shell, ruby, Python, PHP, Java, and Csharp.

This API is free.

Created by Vonage, the cloud based API authenticates mobile phone details. The API proves that a user is contactable on a phone number by validating a patented 2FA text message.

Its key characteristics include:

• Global compliance
• Custom templates
• Mobile and landline verification
• Data analytics
• Worldwide reach
• Optimal text re-routing
• Automatic TTS resend on failed text verification.
• Allows you to generate your code



The API ii designed on REST framework and returns responses in XML and JSON data formats

The API has four pricing plans. The basic tier is free to 500 requests per month, while the Pro package costs $10/month for 100000 calls. The Ultra subscription costs $50/month for 500000 credits. The Mega price is $250 for 2.5 million calls per month.

The API works in a simplified way. The users type in their phone numbers. The API automatically generates a random code and sends it to the user's phone number. The user inputs the OTPs, the API countercheck, and verifies after an exact match.

The API features are:

• Swift with an average of 2-6 seconds delivery rate.
• It reroutes failed SMS through backup operators.
• It provides real-time reporting and ensures data privacy.

The API is free

Developed by Telesign, the API takes into consideration those people who wish not to receive messages. Instead, the API delivers verification code in audio form. The user listens to the audio and verifies the information on the client's website.

This API has similar pricing to Telesign SMS API.