MTN has introduced
MTN Xtrabytes that allows you to borrow data from MTN, just like
MTN XtratimeYou will be charged immediately on your next recharge.

How to activate
MTN Xtrabytes.Firstly dial
*606# to check your eligibility status.
It is possible to borrow
10MB,
30MB,
100MB,
200MB, and
750MBXtrabytes balance can also be checked by dialing
*606#After borrow, MTN will deduct the equivalent amount you borrowed via airtime immediately you recharge your phone.
Some things you should note:*The data you borrowed has the same expiry date as your normal data bundle.
*The data is not transferable.
*MTN Xtrabytes will charge you 10% extra over the data you are borrowing.
*You can borrow data from
MTN XtraBytes even when you owe
MTN Xtratime