I have an AT&T iPhone and AT&T hotspot. I will be traveling on vacation and want to check cell coverage across the different services. I know that I will need to get a Verizon sim and am planning on just buying the minimal prepaid plan. AT&T will definitely be able to check between the hotspot and the phone. However, for T-Mobile and Sprint, how hard is it to switch between them while on the apple sim? Presumably, I will want to purchase a data plan on both and be able to switch between them to test the connectivity. Either way, if I do or do not hear from people, I will report back. The trip will be the weekend before Thanksgiving. Thanks!