I use E6853 on T-Mobile. I run into the same thing the other user stated. Might show 2 bars, but performance doesn't seem to be affected. I also work on the border so I constantly switch back and forth between T-Mobile and Telcel. If you're in a bigger city then you will have no problems with this phone. In all honesty, I would probably go with Z5 and not the premium. I got it for the 4K, but it's a feature I never use. It's like going back to 2007 when I was loading movies onto my BB. That's what I hear you have to to do watch 4K movies. I used to be a power user, but now I'm more into it just being a communication device and a cast device at home.
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