Hi im new to the iphone 3g, i just got it 2 days ago. So ive been trying to use the AIM FREE SMS trick so i can save some extra money on my monthly bill. I cant seem to get it to work and this is what i receive when i send a message i get " your IM has been sent to my cell phone and, although i can read your messages, i cannot reply" ?? i asked a buddy to test it out with me and he doesnt receive anything??? can somebody tell me what im doing wrong? i live canada, i dunno if that matters?

thanks