Wasn't sure where to put this, just a quick app recommendation.
The apps called whatsapp Check it out 59p on the iphone
It's coming to android and nokia soon aswell.Quote:
WhatsApp Messenger is a smartphone messaging app which allows you to exchange messages with your friends and contacts without having to pay for SMS. WhatsApp Messenger is cross platform and is currently available for iPhone and BlackBerry and yes, iPhones and BlackBerries can message each other too! To send and receive messages, WhatsApp utilizes your existing smartphone internet data plan: 3G/EDGE (or Wi-Fi when available)