I am in Juneau all summer, and I use Verizon. My phone works most of the time. The only real problem is when we have a lot of ships in port. Everyone gets off their ship and starts using their phone. It overloads the local service. Extended coverage means that if you have the no roaming fees plan, that you are not in a home area and are covered by the no roaming fees part of your contract. I have that and am never charged for using my phone in Juneau. My phone says extended service most of the time.