Check a phone number before you send an OTP

In Verify phone numbers with the Sinch Verification API, an approval callback decides whether a code goes out, based on the calling code and how often a number asks. That policy doesn’t know what kind of line it’s sending to. The Sinch Number Lookup API can: One call returns the line type and the carrier […] The post Check a phone number before you send an OTP appeared first on Sinch .