Can I use the Sprint / Verizon iPhone 5 (A1429) on AT&T's LTE network?
No. The iPhone 5 comes in 3 different versions, designed to work with different LTE radio frequencies around the globe.
The CDMA iPhone 5 (otherwise known as A1429) is designed for CDMA carriers including Sprint and Verizon. This model will be compatible with some GSM networks internationally, however the device will not be compatible with AT&T's LTE network.
Anonymous replied on Permalink
The LTE is gsm technology and there is three bands but some do overlap. And AT&T and Verizon do on channel 1 or 3. IF YOU HAVE THE Global Model the LTE Channels for both are there but just one or two are shared. So it WILL work! BUT it depends on what the tower or network in your area is using. And the model 5 you have. Please take the advise on the three different let radios for carriers and consider what you want.