I'm upgrading to the 4GS and I'm trying to decide on Carrier. I have 5 lines on ATT , w/ unlimited Data. However Verizon has much better coverage here. In fact I can't always get signals in my house. My question is is the antennea in the 4S that much better than the 3gS that if I stay with ATT I will get better reception just do to the better components? Or should I just switch to Verizon ?