Can my phone work without a data plan?

I am currently using T-Mobile and im looking to buy a new phone. The only thing is that the people at t-mobile are impossible and dont give much help or valid information. So im thinking about buying a phone from somebody off craigslist. If i get a sidekick 4g or mytouch 4g, will it work without the data plan? I believe these phones have wifi so can i just use that?


yes you can.

my family has AT&T and me and my brother have smart phones that we bought off of craigslist that work without the data plan.

My brother has the g1 & a sidekick . they both have wifi so it does work. But you do have to unlock the phone first for t-mobile i believe.