Will internet work on my sidekick 3 if i have a at&t sim card?

Question

if not is there any way i can get it to work? help

Answer 1

as i know the sidekick work only with t-mobile system if you have att than the sidekick its unlock and it denpents of how they unlock it. the internet dont work when unlock on sidekick but phone; text work

Answer 2

The person is wrong above me of how they say "sidekick can only be used on T-mobile".

The Sidekick 3 can be used on AT&T.  It must be unlocked though. You would just pop and AT&T sim card in there. It should work.  Only texting and calling features will work on it. Internet, instant messaging, picture messaging...etc will not work on the phone.