Wrong number shows as device number

[Tina4]

Samsung A21s device displays wrong number in settings. I do not recognise the number. I have never used it. This causing issues when trying to connect via Bluetooth in car as my contacts are saved to my sim which is a completely different number. How do I remove the wrong number and put in my correct number. There is no facility on settings to delete this rogue number?

[MI5 · Accepted solution]

@Tina4 

You have 2 options.

1 - transfer your contacts to your phone memory.

2 - put your sim in an iPhone and use the facility on that phone to write the number to your sim.

It's Settings >Phone >My Number.