If you plan to use a cell phone rather than a landline, one easy way to find out what the best coverage is in your home is to invite all of your neighbors (and/or friends) over for a party. As you wander around, ask people what provider they use. Ask them to let you try their phone to get an idea of the signal. Test out each carrier. By the end of the evening, you should have an answer.
Do keep in mind that every carrier has "bad" spots where the signal falls off. There are also some days when signals are mysteriously worse than other days.
I've had AT&T for 12 years now and used them in Canada, Alaska, and all over the lower 48 states. Have rarely had no coverage when others did have coverage. Have had coverage several times when no one else can get a signal.
Your mileage may vary.
Good luck
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