The MTN 4GB is not really a cheat but a promo from MTN that selects Sims.
HOW TO SUBSCRIBE TO MTN 4GB FOR N1000
◾ Make sure you have N100
◾ Then dial *446*11*4*7*5#
◾ You’ll get a confirmation
message upon successful subscription & 500mb will be given
◾ When your 500MB finish you subscribe again till you reach N1000 for 4GB if you want you can still continue.
◾ To check your data balance, simply dial *559# or *559*2#.
NOTE: This MTN Quick Win data doesn't work on all SIM. Am sharing it for the lucky ones that will get it.