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Re: nexus 4 lte
It is possible, but you would need to flash a hybrid radio and the LTE enabler manually, meaning you would need to be unlocked and be able to fastboot boot a custom recovery image... but why are you worried about rooting the device? It is super simple to do, it's a Nexus device, it was meant to be rooted, modified, and rommed. And if you have an app that doesn't like root, like ISIS or something, you can use Xposed and Root Cloak to make it work.
Originally Posted by thaphoenix2
This will likely give you what you need if you get root... [APP] Nexus 4 Modem Flasher and LTE enabler … | Nexus 4 | XDA Forum
Enabling LTE in the US will work in T-Mobile areas, and a few select AT&T markets (Phoenix, Raleigh, San Juan, Los Angeles, Las Vegas, Oklahoma City, Dallas, Chicago,and Charlotte), because the Nexus 4 only supports Band 4 LTE in hardware. A few Canadian and Mexican carriers use LTE Band 4 as well. If you are on T-Mobile, live in a AT&T market with Band 4, and can live with the battery drain go for it. It will drain the battery significantly faster, depending on signal level it could cause the battery to drain as much as twice the normal rate if you are in a weak signal area. I tried it for a while on AT&T's network, and in areas I travel (Bismarck, Fargo, and Minot in ND, Minneapolis, Rapid City, Sioux Falls, Omaha, Topeka, OK City, and Dallas/FTW) the only area I had service on LTE was OK City and Dallas/FTW, and even then the service was OK, but little difference between a good HSPA+ connection, except the battery drained quicker.