I've been with Verizon since they came to our area (at least 4 years.) I have never had a problem and we have traveled in IL, IN, KY, TN, GA, FL, OH and a few other states that I have probably forgotten. DH & DS had different carriers, but I changed them to Verizon as soon as I could, now DD also has a Verizon phone. I think the service is great, and have never had a billing problem.