I agree with Retriever's comments on ATT in SE Alaska. I have 4G in both Wrangell and Petersburg. ATT even had a new site about 1/3 of the way up Wrangell Narrows on the west side. It served both a portion of the Narrows and Duncan Canal as well as St John Bay and portions of Sumner St. Verizon only has their own facilities in Ketchikan and Juneau where they provide LTE. Elsewhere they roam in an old CDMA network maintained by General Communications Inc, who also operates a GSM network for their own customers. T-Mobile has some roaming agreements in that network but I don't think that includes much data.
The biggest impact on cell networks in SE Alaska is cruise ship, who suck up all the capacity where ever they are.
Tom
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