How to block fiance from iphone 4?

How to block fiance from iphone 4? - 1

Mr number can block the phone calls and a screen lock in the security settings will keep anyone who does not know the code out of the phone

i hope it is not a trust issue there don't need to be in a relationship like that at all nothing but toxic for both involved you need to discuss your trust issues and get that out the way before you get married i suggest