I've been using, and physically carrying, two iPhones for many years. The carrier for my iPhone 5 is AT&T, U.S.A. The carrier for my iPhone 7 is provided by Telcel, Mexico. The number on each phone is indispensable for my lifestyle. Now, I feel it's time to upgrade. I'm thinking of moving up to an iPhone 12. The thing is, I go back and forth between the two countries as I have interests in both. When I'm in the U. S., I almost exclusively use the number with the U.S. area code. When I'm in Mexico, I use the Telcel number full time. However, I also use the AT&T number very often. The idea that both numbers can be contained in one device is very attractive. But my question is, can I use both carriers, one for the U.S. number, and the other for the Mexico number, both in the one device? I hope.
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