Honestly, the one and only place I've really noticed issues is Northern California. No issues on the eastern seaboard and gulf states, TX, IL. HI, AK, or WA. I'd happily switch to T-Mobile if they didn't have so many holes in coverage in my area. I was disappointed that they aren't planning any 600MHz deployment anywhere near me. Coverage and reliability are still king for me. My wife and I just don't use that much data, but what we do use needs to work all the time (or as much as possible).