It might be a little late, but I just joined the forums and I'll give my advice for your problem. I Just got stationed in Fairbanks at the first part of July and had the same problem when I landed, had voice and text but no data.
Go into your phone settings and check "Use data while roaming" or something like that and you'll have your 3G in Alaska
Go into your phone settings and check "Use data while roaming" or something like that and you'll have your 3G in Alaska