Adding phone verification
Hello friends, I want to add phone verification to my forum because of spam ,Although I searched for hours, I could not find a solution for Vanilla forums, I have a php code that you write your phone number and code will be sent and activate etc. but I need a thing that you will be typing your phone number when you become a member, then a verification code will be sent to your phone and you will write and you will be able to activate your account. How can I do that? Thanks.