I use 3 iPhones.
A 5S, a 6S and a SE[1.0].
Bottom line: ABS; Always B charging...
2 have sim cards for different States.
The oldest one has a self installed New Battery.
YMMV
I’m on my BlackBerry now. The Apple and Android devices: I hate them.
If Elon wants to truly do something to reduce government spying, he should re-hire Research In Motion original engineers and revive the old Classic with super security.