Roam Mobility - how's their coverage while in port in Alaska?

Starting a new thread as I thought the discussion is about coverage while in port.

How's T-mobile network coverage in Alaska in port? 2G, 3G, or 4G LTE speeds?

See: http://boards.cruisecritic.com/showthread.php?p=47049987#post47049987

Love Roam Mobility.... BUT not for Alaska. There is no coverage there. They recently just offered coverage through an alternate partner.... but they charge a premium if you are a heavy data user.

I recommend you go to Bellingham to get an ATT sim card pre-cruise or stop into one of the port ATT stores between you excursions.