I'll be driving in Alaska in July, planning on doing the same thing. I'm not concerned. I just returned from a week in Nevada, did the PM $20 US roaming thing, it worked perfectly. I watched my phone roam to both T-Mobile and AT&T while I was there. ...
Yes - just to elaborate on that comment. Turn on data. Your phone will show you it used data (because it did, when it sends the picture in the text). But you won't be charged for that "texting data", and it won't be counted against your data allowanc...
Ahh, it's not only only you who's disappointed / annoyed. Me too. A few days ago I went to LD and purchased a SIM card for my wife. Now tonight with SIM card and the details of her existing phone carrier in hand, I go to sign her up for that $30 plan...