can i buy a tmobile phone anywhere and just put my sim card in it?

[Megan]

like at the flea market...... places like that
will it work? or do i have to buy a phone from the company?

 

[Unregistered]

Yes you can provided bot are same T-Mobile company.The network is in many countries.Suppose if the mobile that you are about to buy is locked with Israel T-Mobile and yours is U.K then it wil not work unless you unlock it.To unlock there are many genuine providers like unBBlock.com