Does anyone know how I can get a T-Mobile Sidekick III to work with AT&T? I know it's possible because they both use the sim card thing. But help please

The internet won't work on it.... all it can be used for is Voice/Texting. I think it's just by popping in the sim card and restarting the phone...

As long as the phone is "unlocked" it should work.

double check with AT&T so you get the right requirements. I bought an AT&T phone, but I don't have AT&T and my phone works fine.

I think you can call AT&T to get the code to unlock your phone.

& then put the new SIM card in.

And Lindsey is right---only the calling and texting features will work.

Yeah, I know, the internet features won't work on the phone. I just need to know how to unlock the phone. I know that AT&T won't unlock it for me. I just don't know the process

if you buy a phone that's already unlocked, then all you have to do is switch the sim cards

I found a youtube vid that might work:
http://www.youtube.com/watch?v=aPIKYLMeMMc

This thinks calling T-Mobile might help.

you have to get the phone unlocked and get the code from the previous owner of the phone you may need to call ATT first

I don't need help anymore. But thanks to everyone who tried helping. I did not buy a sidekick. I had the sidekick III and the sidekick slide when I had tmobile. I was able to get both phones unlocked, but I cannot get a data plan, so there's no point of having the sidekick if I can't get the internet on it. iphone Christmas. Thanks everyone!