More news has come out about the 4G LTE capabilities of the LG Nexus 4 after some people have managed to connect to the 4G LTE network of AT&T on the band 4, AWS spectrum.
This frequency is used only in a few markets and it is hard to tell if you can get it, since AT&T does not particularly advertise the frequency it uses for LTE on a location basis. This means that you would have to test your LG Nexus 4 to find out if you can get it. This happens to be the same as the LTE frequency that Canadian users can connect to with their LG Nexus 4.
How to use AT&T LTE on your LG Nexus 4
In order to make the test you simply type *#*#4636#*#* into the LG Nexus 4 and then choose Phone Information. You then scroll down until you see a menu pull down that says. WCDMA. If you toggle this you should choose LTE/GSM/CDMA auto (PRL). When this is completed you will know if you have LTE from AT&T as the icon will change from the H, to 4G.
Those who live in Dallas, Chicago, Los Angeles, Phoenix or Oklahoma should be able to get it straight away suggests Droid-Life. No word yet on what other locations are on band 4 at this time.