can i put a tmobile Sim card into an at&t Sony Ericsson T700?

If its unlocked yes you can, If its locked to at&t then you will need to get it unlocked first.why don't you try it it cant break it
 
HI no you can't use your t-mobile sim in sony ericsson t700 mobile until you unlock it from AT&T network .You can easily unlock your phone using sites like ClassicUnlocking.com here they are providing unlock code for all mobile models at reliable cost ...After unlocking the phone you can freely use it with any GSM sim ....
 
Back
Top