Some enterprising tinkerers on the XDA Developers forums are demonstrating that despite the lack of a working signal amplifier and filter in LG’s device, it’s still possible to force the phone onto an LTE network from the phone’s debugging menu — at least on LTE band 4 (1700MHz and 2100MHz) on Canadian carriers Telus and Rogers.
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.
Turning back to the US, AT&T is also licensed to operate on Band 4 (Verizon uses the incompatible Band 13), which held some promise for getting things to work south of the border. Unfortunately, we've only been able to test on AT&T in a market served by Band 17, which has been predictably unsuccessful. While we can't say at this point whether the trick will work elsewhere, we'll let you know as soon as we hear anything new.
http://www.theverge.com/2012/11/23/3681450/nexus-4-band-4-lte-support
Haha I knew this was theoretically possible..but It's really refreshing to see it actually working! awesome work by the XDA Dev community.
PS: Btw Tmobile uses Band 4 for LTE as well!
Edited to Add:
Vid of LTE working on N4
http://www.youtube.com/watch?feature=player_embedded&v=GXOY9EVZ4vA#!