Byteplant Phone Validator


This plugin uses the Byteplant Phone-Validator API ( to check if a phone number is really valid and callable.

Supported Plugins / Compatible Forms

The plugin works seamlessly with:
* Contact Form 7
* Gravity Forms
* WPForms
* Ninja Forms
* WooCommerce

The plugin can also be easily integrated into any 3rd party form.

Key Features

How does it work?

The Phone-Validator real-time validation API provides detailed information for each phone number:
* Line type: FIXED_LINE, MOBILE, VOIP etc.
* Geolocation: Region and city
* Phone number correction and re-formatting according to national and international standards

During the entire validation process, the phone number is not contacted in any way, nor will any phones connected to a line ring.

Data Protection and Privacy Policy

Please see the Frequently Asked Questions section.

Getting Started

The plugin requires an API Key. Please sign up for an account at (no credit card required).
The trial account comes with 100 free credits.


  • Plugin page.


  1. Unzip and upload the plugin to the ‘/wp-content/plugins/’ directory.
  2. Activate the plugin through the ‘Plugins’ menu in WordPress.
  3. Configure the plugin in the Settings section of the Administrator Dashboard.
  4. Register for an API key and get 100 free credits (no credit card required):
  5. Copy and paste your API key to the Settings section of the Administrator Dashboard.

If you need help, just send us a quick email to


Data Protection and Privacy Policy

We are committed to protect your data and your privacy when processing personal data.
We do not process or store phone numbers for any purpose other than validation.
We do not share any client data with any third party at any time.
We keep all data supplied by clients for the purposes of validation as confidential, to not disclose data to anyone within our organization without a need to receive it for the specific purpose for which its is being disclosed to us, and to not disclose this data to any third party.

Phone-Validator is a service operated by Byteplant, a company located in Germany and operating according to EU General Data Protection Regulation (GDPR) standards and the German Federal Data Protection Act (BDSG) – one of the strictest data protection and privacy legislations in the world (see for details).

Personal data according to the German Federal Data Protection Act means any information concerning the personal or material circumstances of an identified or identifiable individual. This includes your name and address but also data like your phone number and email address. All data is subject to a special protection in accordance with the German Federal Data Protection Act and other legal provisions which we enforce using both technical methods and strict company processes.

Do you store validated phone numbers?

All data from API requests and batch/list processing will be automatically deleted within 14 days.

Is this plugin free?

This plugin is free, but to use our service and the API after the free trial you will need a paid account.


Hamal 31, 2024
doesn’t work. it says that the API is not correct, although I have configured everything correctly.
Jeddi 1, 2020 1 reply
This plugin is very cool and useful, easy installation and use. It helped me a lot, I really needed something like this. Keep up the good work and the plugin updated 🙂
Jeddi 1, 2020 1 reply
We have been using the Phone Validator for over a year now. It integrates seamlessly with Contact Form 7, the setup took less than 30 minutes. Great little tool which increased our data quality significantly.
Qawıs 30, 2020 1 reply
I’m no techie and had issues getting the plug in to work due to my lack of experience but Byteplant customer services helped me get it working and followed up to check everything was working as it should. Great service, great product!
Qawıs 25, 2020 1 reply
I’ve used this plugin to successfully validate telephone numbers on multiple landing pages. It blocks incorrect / bogus numbers and as a result has improved the quality of leads and reduced the sales team’s workload. It integrates easily with Gravity Forms, so all in all, very happy with the plugin and service.
Read all 5 reviews

Contributors & Developers

“Byteplant Phone Validator” is open source software. The following people have contributed to this plugin.


“Byteplant Phone Validator” has been translated into 1 locale. Thank you to the translators for their contributions.

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Interested in development?

Browse the code, check out the SVN repository, or subscribe to the development log by RSS.