It seems that a simple software update can allow the Nexus 4 smartphone to run on LTE Band 4. All users have to do is dial *#*#4636#*#* (INFO) or launch the Phone Info app. After that, choosing to connect to AWS networks should allow the Nexus 4 to run on LTE networks on Band 4.
The AnandTech report states explicitly that the LG Nexus 4 only works on LTE Band 4, on 1700/2100MHz frequencies, and supports bandwidths of 5,10, and 20MHz."
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