If you still have these on Iphone go to: Mobile data-SIM Applications- MTN Caller Exchange and MTN MsgXpress: Turn these two off.Can't find the "legal" option in the current app. All my other things were already opted out and listing as "No". I still get a USSD popup every few days though. I mean, MTN, why all this junk in the first place? Just don't spam your own customers then they won't have to opt out of so much junk all the time. Also, POPI not going to help here?