I'm a tmo user and won't be switching carriers and currently have a nexus 5. I c considered the g2 but decided against it due to the issues with root and kit Kat. I know it isn't even announced yet but how tough d do you think the T-Mobile version of the g3 will be to root? Assuming it's available in june or July, I'm going to give it another month or two before I'd upgrade to give the accessories and devs time to do their thing.
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