I live in Juneau for part of the year. I have the Verizon 50 state plan. The cell phone companies in Alaska have had poor customer service in the past. I get good service in Juneau. I can also use it in Icy Strait, Petersburg, Ketchikan, Prince Rupert BC, Port McNeill, Cambbell River and Nanaimo.
Verizon sent me a note a couple months ago telling me to dial #228 I think, and it would help my pnone work. I did that in Juneau and it really helped. I don't rememberf the number to dial, you should contact Verizon and ask them. I have had several people in Juneau tell me they did this and it helped.
You should also remember that the peole getting off the ships and turning on their cell phones can overwhelm the local system. As many as 10,000 cell phones can be added to the load in just a few hours.