OK so my official carrier is T-Mobile, but my phone is with Sprint. I got it unlocked the other week, it was working fine with the EDGE lettering at the top. But everytime I go on the train underground it changes to 1xev and tells me my Mobile Network is with Sprint PCS. I restarted the phone and turned the connection off, still said 1xev. But the funny thing is when I take the train back home it works normally saying EDGE again.
Any help would be great :)