Moving from Android

[jamezr]

Just curious which service you use to be able to do this?
I have a Note 5 and want to get a 6S Plus and switch between them, same way you are doing.
AT&T tech told me each time you switch the sim card, the phone will work but the data needs to be reset in their system otherwise you can't receive data?
Thoughts?

I have Verizon and AT&T. I have routinely switched sim cards but only on the same carrier. So i switch sims between Verizon phones without issues for years. I have switched sims between AT&T phones with issues for years as well.
Luckily both the Note 5 and iPhones use the nano sim so it is just a simple swap. You should have no issues switching between any AT&T phone as long as the sims are the same size.