I'm visiting Yellowstone from Canada soon and hope to take my iPad and unlocked iPhone 4. Which carriers sell prepaid SIM cards in Montana? I imagine coverage is sparse, so what options do I have?
AT&T is probably your best bet. Verizon has by far the most extensive coverage, but they are not a GSM carrier and so you can't get a SIM card for their network. AT&T recently acquired Alltel's network in Montana, so their covereage is easily second-best. There are also some regional carriers that have service in out-of-the-way places that neither of the big carriers do, but we're not sure if any of them offer SIM cards. about 8 years ago