We all know how annoying it is to receive lots of spam messages from MTN everyday. Thankfully , there is a new way to block those messages ; FOREVER!.
If you want to stop receiving promotional messages from MTN , Simply text STOP to 33111 via SMS.
You will get an sms that reads :
You will be removed from our campaign database within 24hrs. Thank you
That’s all!. If this method dosent work for you then you should try manual blocking : How to Block Spam Sms On Android .