That would be up to Sprint, the company which actually provides the service. You might want to check with them. However, until Alaska gets a whole lot more people, I'm guessing that it's not going to be a hugely profitable market for cell phone carriers.
Amazon needs to provide "roaming" service with other carriers as there is a lot of areas that do NOT have Sprint coverage. I live in New Mexico and most of the state has no coverage at all and the areas that do have coverage have only slow speed 1X coverage. I am sure that there is wireless broadband coverage in Anchorage and Fairbanks and probably some other large towns in AK, but the carrier is not Sprint. In NM Verizon has a much larger coverage footprint than Sprint, but currently Amazon does not let you "roam" on other carriers either for free or even if you wanted to pay.
Anyone living in an area without wireless service, please send an email to Amazon and ask them to offer data roaming and/or coverage in your area. The more feedback they receive the better the chances are of getting service and coverage in additional areas.
And to the smart little response from Brent, how do you know it is selling so well. Do you have sales figures ? Maybe there is just a very limited supply causing the long back order. Regardless of sales numbers, I think Amazon does care about customer concerns with the unit and lack of service that many people are experiencing. I think they are willing to listen because they are a very customer focused company.