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Because you're in an area that isn't a 3g area

2 Things possible:
1. In Menu>Settings>Wireless and Networks>Mobile Networks>Network Mode>you have selected GSM only, you need to be in WCDMA or auto/dual mode to get 3G, otherwise your 3G antenna is turned off.
2. You are in auto/dual mode, but the 3G signal is weak. When this happens the phone defaults to using the stronger connection which is EDGE.
Yes, depending on the carrier, it may not support the same 3g bands, in that case you would be stuck with edge, which is basically 2g. It's always a good idea to do some research before those kinds of purchases. Good luck, I hope it works out for you.Im going to give this a try
I bought the phone unlocked on amazon could that be a problem too?