I have AT&T with no problems. Have not seen anywhere in TV that my phone didn't work, tho with varying numbers of bars. Having said that, I know that the phone model can make a difference - have had times over the years when I had a signal and DW didn't.
Note that some of the homes have poured concrete walls with rebar in them (and look like block homes from the outside). While I haven't tested my phone inside one of them, I would expect them to really screw up signals as they canl act as a Faraday cage (just like some office buildings).
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