Does anyone actually know of a free sms sending script that works?

Back when I was in the seo business a year or 2 ago, I always wanted to set up a free sms site because it would be easy maintainance.. however ive never found a working script for it?

I know that these sort of scripts no longer work for uk mobiles, but surely there are some that work abroad?

help!?!?

Look into the twilio API