Initially, I won't be switching over to the Verizon iPhone. My first experience with AT&T was buying the iPhone 4 on release. I have not been disappointed with AT&T's network whatsoever because I usually toggle my network settings to use their Edge network for voice rather than their 3G network. While on the Edge network, coverage has been very close to Verizon (for work I have to carry two phones) and I don't get dropped calls. Their 3G is great for data when WIFI isn't available, but the dropped voice calls are a bit much!