If you only have those two options, it usually means that your phone isn't provisioned correctly. You should call T-Mobile and confirm that they have the data plan added to your account, if they do, ask them to resend the service books. If it still doesn't work, go to Options > Advanced Options > Host Routing Table, press menu and Register. Then do a battery pull.
I rang them up before and they didn't really get what I mean't heh.
They offer 'Instantemail' which goes to instantemail.t-mobile.co.uk and I had to ring them to activate maps... bb messenger works OK. So what do I say to them/ask for?