OK, I have a slightly different question but kind of along the same lines... around here I have a handful of older cell phones that I switched in between off and on well testing, flashing, tweaking, rooting, or whatever, but they are all just 3G phones (some smartphones, some feature phones) and I would switch between them sometimes a couple times a day with no issues online or with a phone call to 611, but I haven't done it in a year or so and definitely not with any 4G phones yet. So are we saying that switching from a 4G phone to 3G phone then back to 4G will REQUIRE me to get a new SIM card? No more freely switching around phones multiple times a day?