Perhaps my iPhone 6s isn't capable of what I'm trying to do (or maybe no phone or carrier allows such a thing), but I thought I'd ask here before I give up. When I'm at home, I use my regular Verizon account on my iPhone 6. However, I travel for business a lot and one of the places I travel frequently I'd like to be able to use T-Mobile and their GSM network. I had this idea that I could take a T-Mobile sim card, put it in my iPhone and then be able to switch back and forth (manually) between Verizon and T-Mobile as I needed. When I tried this though, the phone automatically defaults to the T-Mobile sim card and doesn't seem to give me any option I can find to switch back to Verizon. The problem is that at home there's no reliable GSM coverage. Remove the T-Mobile sim card and it reverts back to Verizon just fine.
So anyway, I had been hoping there was a way to just go in to settings somewhere and easily switch between Verizon and my T-Mobile sim card. However, so far it doesn't look like that's possible. I really don't want to have to manually switch out my sim card every time I travel (it's a real pain in the neck with the Otter case I have). I guess if there are no options I'll just have to get used to carrying two phones around.
