When you're out of data there's always an alternative, this is called Mtn Double data which is made available to all new user that is new SIM users though it has been working and still working up till now but their is little different compare to how it is being given before.
Just as it sounds, MTN Double data is one of MTN data plans that gives you twice of the megabytes you purchase and allow you to keep enjoyment your internet surfing. MTN double can work perfectly on Android, iPhone, iOS and any devices that can access internet so nothing like tweak or tricks.
MTN double data valid for just 3 month not like before that you have it for 6 month meanwhile 3 month is still okay with good internet speed.
Remember, MTN data is just like normal Bundle but it's only working currently on new SIM that new customers, so if you want to enjoy too just visit any nearest store to get your new SIM , there after you'd going to receive eligibility message, then you can dial *131# to buy a new data bundle which will be doubled for you.