ilovejedd, some of the MVNO's (mobile virtual network operators) have exactly the coverage you require. I switched from AT&T to Straight Talk. They use AT&T's network. Whatever USA-wide coverage (voice and 3G data) I got with AT&T I still have with ST. There are some claims that my signal is a 'second class citizen' on the AT&T cell towers but my experience is no degradation of service quality after I switched and I've traveled cross-country several times since I switched.
Why did I switch? For the past year or so, I've paid just $43 and change every month (pre-paying one month at a time, auto-pay gives a small discount to the $45 rate). I have no contract and get unlimited calls, texting, and 3G data. There are reports of throttling and warnings at high data consumption but for my 1 GB-or-less monthly consumption rate I had no issues at all.
AT&T (or Verizon) wants something around $80 a month for a worse plan. That is just non-competitive, even if I have to pay full retail for my next iPhone. Now it is also true that AT&T could shut off the entire ST virtual network some day. I'll have to make a switch if that happens. AT&T's customer service is also much easier with AT&T having a solid retail presence in my area, not that I've needed it.
Anyway, don't feel locked into your cellular service provider just because of coverage.
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