From time to time, you need to know your data balance so you can be aware of the next step to take. See How to check your MTN Data Balance?:
The code for checking your MTN data plan is *559# OR text 403 to 131.
To check your MTN shared data balance, just dial 4617#.
By so doing, you will know when you are running out of airtime and when it is still enough.

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