Phone
When I upgraded my phone I managed to unlock my old phone and gave it to my mum to use. Although my mum can use it, and it has her SIM card in it, both phones are still connected to each other. My phone registers her calls and photos etc and vice versa.
I think this may have something to do with my Apple ID but I am scared to do anything in case I lose all my contacts/photo/videos.
Any help/ advice would be greatly appreciated.
Thank you in advance.