Originally Posted by
bwiadca
Speaking of Tmobile. How to add ESIM to iPhone 14 or 15 when you want your primary number to stay and have ESIM from another country as a secondary number and internet provider when you are in that country?
Have your new cellular service assist you on installing an esim for their service. When 2 esims are active, you can choose between them which is to provide data, which will be for voice. These can easily be switched endlessly without any issues. IOS will prompt you when you first restart for those setting, then you can change them in: Settings-Cellular, then choose which line is Cellular Data, which is to be used as Default Voice Line. It is easier to do than to explain it actually.