[RobertAM]

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.

https://rapidapi.com/collection/phone-verification
https://numverify.com/?fpr=geekflare

Also, worth noting that some players will not be willing to provide their phone number.