With the Proweblook Phone Validator plugin you can easily verify if a phone number is really valid and callable (https://proweblook.com).

Prevent out-of-area leads by validating phone number area codes on your contact forms before submission.

With the Byteplant Phone Validator plugin you can easily verify if a phone number is really valid and callable (https://www.byteplant.com/phone-validator/).

A simple and nice plugin to get auto country flag from user ip address on gravity form phone field.

Adds a country flag and phone validation to the WooCommerce checkout phone field. Supports Classic and Block Checkout.