I'm unable to make calls or send SMS with my phone number 08133615920. May I know the cause of this please?

I can't send sms I don't know the correct sms centre number

I have registered my sim but I'm unable to make calls

Ever since I entered UK in Oct 4, there's no MTN signal in my phone, I lived in uk and line has been roamed and about 4000 naira was paid to let my line to stay active yet i...

I’m in the uk Please help my SIM card stopped working