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There are no roaming charges in Alaska. In fact, most of the Alaska roaming doesn’t even count for the monthly domestic roaming cap.
Was as your mom using the phone on a cruise ship by chance? That doesnt count as use in Alaska. Cruise ship roaming is extra for every carrier. Your mom would have received a text message if she connected to a cruise ship system warning her of the charges. Did she ignore this warning?
I believe cruise ship roaming is $5.99 per minute.