I am currently a Verizon customer using a Galaxy Nexus, but I plan to switch to T-Mobile when my Verizon contract is up on May 9. I just purchased a brand new, unlocked Nexus 5 on Ebay that I plan to use as my first T-Mobile device. My question is, is it possible to root it before it has been activated? If so, will rooting it in any way affect the ability to activate it?