My son's first trip to Aruba! I am concerned about him calling home to the USA and not spending a lot of money to do so. Should he rent a phone? Are calling cards just too hard to use? Fast Phones? Digicel? Aruba Phones? He is only there for a week and Mom, that's me, just needs him to check in or to call if something is needed. The phone calls, as you may imagine will be quite short. Does he really need a phone while on the island? Any suggestions would be greatly appreciated. Thank you!