Airtime is the amount of money added to your account for placing phone calls and using mobile data. Sometimes a person wishes to ‘borrow’ or ‘gift’ his or her airtime to another MTN line, you always can take the advantage of a fast MTN airtime transfer service and share your airtime with others. t also has a second name. Have you heard of Share ‘N’ Sell? This is a cool option available to all current MTN users (prepaid or postpaid). The service lets you send your credit (airtime) to any other MTN number.