The article suggests that buying a Verizon iPhone will give you LTE service on AT&T. This is not the case, as the two phones support mutually exclusive LTE band

The article suggests that buying a Verizon iPhone will give you LTE service on AT&T. This is not the case, as the two phones support mutually exclusive LTE bands. The AT&T iPhone 5 supports LTE bands 4 and 17, while the Verizon iPhone 5 supports LTE bands 1, 3, 5, 13 and 25.