How to know MTN number is a common question among MTN users who may have forgotten their mobile number, recently inserted a new SIM card, or rarely share their contact details. The easiest and most popular way to know your MTN number is by using a USSD code directly from your phone. Check the SIM card packagingIf you still have the original SIM card holder or starter pack, your MTN number is usually printed on it. Check your MTN account or mobile appIf you have previously registered your MTN number with an account or mobile application, your number may be visible there. Contact MTN customer careIf all other methods fail, MTN customer care can help you retrieve your number.