Am unable to make calls from my MTN number and am not around in Nigeria to do either since upgrade or sim reregistration

Please I need this issue resolved immediately

Many MTN customers are not aware of the new code. They only know the old number. Let's explore some reasons you need them to contact the customer care center. Here are a few...

I can't make calls with my...

For some few days I have been unable to make any calls as i keep getting 'number busy" when i try calling even though sometimes i do recieve calls. Today i woke up to find out I...