hi jhenderson,
I don't have A780 but owing E6 which is similar what concerns OS I can advise the follwoing:
- navigate to dialpad (in my phone it's the button in the upper right corner of the main "touch"-screen)
- tap "Menu" - the 1st button from the left in the bottom of the dialpad screen
- select <Setup>
- then select <Network Setup>
- tap "Menu" button again and select <Search Setup>
- try changing values for <Band> field
As far as I know Cingular/ATT provider uses 850 Mhz band in some regions so I presume your setting should be 850-1900
if still no luck then try other's provider SIM to check if it works - say it's not transmitter chip problem of the headset itself.
Hope this helps.
Let us know the results.
Good luck.



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