There has been a bit of confusion about the latest Nexus phone’s carrier compatibility in US. For instance, does the Nexus 5 fully work on AT&T’s network? The answer is Yes. It is fully compatible with all of AT&T’s existing 2G, HSPA+, and LTE infrastructure. If AT&T service is available where you live, you can use your Nexus 5.
Right now, AT&T works on 4 different bands, 850 MHz and 1900 MHz for 3G (5 and 2 bands respectively), and 4 and 17 for 4G LTE broadband service. In future, AT&T is likely to expand its band to 29 and 30.
Nexus 5 3G bands:1/2/4/5/6/8/19
Nexus 5 4G bands: 1/2/4/5/17/19/25/26/41