
Last week, Anandtech reported that "Band 4 (AWS) could essentially be supported with the power amplifiers and transceiver that already are onboard the Nexus 4, but again it ultimately comes down to a particular OEM choice whether these get supported." As we've written previously, getting LTE support across multiple carriers across the US and internationally is a minefield, which is why Google chose not to include support for multiple LTE bands on the Nexus 4.
[Source: The Verge]