What happens if I change SIM to my iPhone?

[digitalove]

I was wondering if I have to reinstall the iOS of it's automatically keep data of the previous backup.

Sorry for the ignorance but I never did it...

 

[hafr]

I was wondering if I have to reinstall the iOS of it's automatically keep data of the previous backup.

Sorry for the ignorance but I never did it...

Nothing will happen with the content on your phone, nothing at all. The only thing that changes is the number that people will have to use to reach you.

You might have to reactivate iMessage and Facetime though.