I know this is very complicated and requires a API via popular phone-hosted services, but is it possible for SMF to develop this feature without having a API?
I think this feature will be very useful for SMF 2.1 version. Doubt this will ever be implemented but if it does, then it's a miracle :)
It's already being done for 2.1 :)
http://www.simplemachines.org/community/index.php?topic=530816.0
It's a miracle! It's a miracle! :P
;D