HTC Desire P voice/MMS works, but 3G doesn't I brought a phone (HTC Desire P) from overseas to U.S.A. I got a voice/data plan with AT&amp;T. We tested the voice but forgot to test data, and later found that the 3G data isn't working.

I tried to turn on mobile from the both from the UI (it auto disconnects after several seconds) and with the android debugger:

adb.exe shell data enable


but I get "Permission denied".

Does anyone know anything that could point me in the right direction?
The HTC Desire P does not support AT&amp;T's 3G frequency bands. Its antennas support the 900 and 2100 MHz frequencies, whereas AT&amp;T has deployed 3G on the 850 and 1900 MHz bands.

You cannot use your phone on AT&amp;T's 3G network. If you want to determine if another device would be compatible, you may wish to look at Can I use my device on a different carrier?