Originally Posted by JLmelenchon
Do you think that it will be something technically possible with sourcemod and a mysql database, of course with the help of a server that will send a verification code to the player. That migh be expansive or not even possible, but it is worth asking.
Very much possible, just build a small SP script that calls HTTP API as needed. Lots of phone verification api exists but do cost based on the sms messages needed.
Also, worth noting that some players will not be willing to provide their phone number.