As of Saturday 14th 2016 this cheat is working affectedly..
No long stories tho lets go straight to trick, well it does not work for all sims tho, just selected sims and also it seems its a loop hole on MTN Network. So i will advice you do it and get the 5GB then download those things you needed to download. it only works on PC and Andriods
FOLLOW THESE STEPS
Dial *198# on your MTN sim
Reply with 5 and 3
then wait for a message that looks like this…
If it tells you REQUEST TIMEOUT or Unreachable | then your sim is no eligible. LETS GET BROWSING FOLKS…