Number is unknown on iPhone 6
I have recently gotten an iPhone 6 from my dad, (it’s his old phone) and i factory reset it an everything back to normal and I’m having problems with getting imessage to activate and my number isn’t showing on ’My Number’ in Phone in settings. Can somebody help? (yes I have a sim inserted and everything) I want my number to be shown so I can use it for iMessage.
iPhone 6, iOS 11.2.6