Bad phone numbers quietly break SMS onboarding, 2FA and CRM imports. Here's how to clean them at signup time with one HTTP call.

The request 

import requests r = requests.get( "https://phonekit-phone-number-validation-carrier-line-type.p.rapidapi.com/validate", params={"number": "07911 123456", "country": "GB"}, headers={"X-RapidAPI-Key": "YOUR_KEY", "X-RapidAPI-Host": "phonekit-phone-number-validation-carrier-line-type.p.rapidapi.com"}) print(r.json())

What you get back 

{"valid": true, "e164": "+447911123456", "international": "+44 7911 123456", "line_type": "mobile", "carrier": "JT", "region": "GG", "timezones": ["Europe/Guernsey", "Europe/London"]}

Practical uses

  • Store e164 only, so duplicates stop slipping in as "07911…" vs "+44 7911…".
  • Block line_type: "voip" or "fixed_line" before you pay to send an SMS code.
  • Use timezones to avoid texting people at 3 a.m.
  • POST /bulk cleans 100 numbers per call for CRM imports.

It's built on Google's libphonenumber metadata (240+ regions). Free tier: 200 calls/month. PhoneKit on RapidAPI

What do you use for phone validation today? Happy to add fields people need.