To subscribe, just be sure to have a minimum of
N300 (three hundred Naira) in your MTN sim and
Simply dial
*131*1*5# and select the plan, just as you see below.
Choose the second option by typing 2 and tapping
the send button. N300 will be deducted from your
account balance and your 3GB data for the
weekend will be activated
Hence, if you are looking at having a weekend with
some more downloads, surfing or more data to
take you through, the mtn 3GB for N300 data plan
might be the best bet.
Source: Gltrends