You can do this by dialing *123# on the device and following the menu.
How does it work?
There are two rates for data bundle: an in-bundle and an out-of-bundle rate. There is a fixed rate for the in-bundle. If you exceed this, an out-of-bundle rate of Afl. 2 per MB will apply.
What happens when I exceed my permitted amount of MB’s in my package?
For every additional MB outside your bundle, you pay Afl. 2. Of course, you can always buy a new bundle. This will commence on the day you activate it. The validity of bundle can vary from 1, 2, 3, 7, 14 to 30 days (or up to the maximum number of MB’s you use). This depends on the type of bundle you choose. You can renew your bundle up to 2 hours before it expires.