Hello,
I just bought an ulocked a780 to use it on the T-mobile network. It is a chinese product (R52_G_0D.50.AHP). My problem - the call drops as soon as the screenlight or the backlight turns off. If the screen turns off after 30-secs the calls is lost immediately after that. If the screen is set to turn off after 5mins, I can talk 5 mins non-stop, but again as soon as the light turns off after 5 mins, the call drops and I have to make the call again. Interesting part is when a call is made while the cell-phone is plugged in to the charger (cell phone is charging), I can talk any amount of time, even after the screen goes off!!!

Also, when the cell phone is charging, the battery in the Device Status go at the most till 60%, but when I take it off the charger, it goes back to 100%!!

This is troubling me a lot!! Are these all battery issues or cell phone?! Any help on this matter will be appreciated.