MTN seems to be doing everything possible to provide their customers with the best services and promotions. They introduced this service once before but it became unavailable as time developed.
All MTN subscribers have no excuses for not calling back now, not after you got a notification,Nah ..lol
You can activate MTN missed call service by texting MCN to 131, and you can deactivate by texting NOMCN to 131. Enjoy!?