CrazRoid: "Well, every Android fan was mad at Google for not putting LTE capability in the latest Nexus 4. However, we recently found out that the Nexus 4 actually has a LT chip in it but it’s just not functional. Today, some genius Canadian Android lovers have reported that you can actually use LTE on your Nexus 4."
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Phone Information > Set preferred network type > LTE Only
and you should check the APN info to make sure it's set for LTE usage.