In compliance with NCC, which directed all mobile network providers to provide an opportunity for subscribers to opt out of any service provided. MTN has provided a ussd to opt-out of unwanted text messages.
Sometimes they send you messages that are annoying and then sometimes they we just deduct your money and many other things.
Press 1 to Opt-out of mobile Ad Reply with Yes to opt out of advertising After the above steps, You will receive an SMS saying you have successfully opted out of their Mobile Advertising.
I think this is quite impressive and it save you from getting annoying messages from MTN.