How can I retrieve my mtn line back

Why can't i receive or make calls with my Nigerian Mtn sim card here in the UAE? I have tried to reconnect my MTN Nigeria and is not coming up. I also enter the number in MTN...

I can't receive call on my line but I can call out since have retrieve my line. 09161524812

I misplaced my number and in diaspora, how can I retrieve my mtn line while here pls. Thanks