Does the antennae being partially on the inside of the cover mean the One X (and the LTEvo) will turn themselves off if you pop the back cover off, much like the Windows Phone Titan II? Not that I have much reason to remove the back on a phone that's powered on, just curious.
If it doesn't, then it's going to be important to do it yourself before opening that cover, in my opinion.
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By the way, I highly recommend the comments here -
Sprint 800 MHz LTE Set For Launch In 2014 - Sprint 4G Rollout Updates
2013.