The bigger problem is the AT&T network. In a Consumer Reports study, AT&T’s signal ranked either last or second to last in 19 out of 20 major cities. My tests in five states bear this out. If Verizon’s slogan is, “Can you hear me now?” AT&T’s should be, “I’m losing you.” […] You have to use AT&T’s ancient EDGE cellular network, which is excruciatingly slow. The New York Times’s home page takes 55 seconds to appear; Amazon.com, 100 seconds; Yahoo, two minutes. You almost ache for a dial-up modem.
— New York Times: iPhone review