Htc Hd2 3g problems?

I already tried completely restarting my phone, and i cant get reception anywhere. Anyone else have this problem before? I also tried turning on the data connection, but a pop up says, "the answering modem is disconnected. To check your connection settings and change them if needed, tap settings" I then tap settings but I'm not sure what to do from there. It shows:
T-Mobile Data:
Add a new modem connection
Set up my proxy server
Manage existing connections

My work Network:
Add a new modem connection
Add a new VPN server connection
Set up my proxy server

Plleaasee Help :(
 
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