Let me start by saying that my wife is on the cingular network (Houston) while I am on T-mobile network.

She has her new unlocked T680 and I carry a BB8100. Her old T600 was terrible with the radio reception, we could never talk clearly until it finally died. We are now experiencing a similar poblem where when we call each other, there is so much static. We do not experience this when we call a landline or someone else on a different wireless network.

This is puzzling, can anyone share on incompatability issues between the two networks.....