there was a massive leak of data, your name, ic and phone number registered to that IC .... news like 10 years ago ? if your phone is registered before that leak, high chances it is part of the leak (like my mobile phone now registered 20 years ago - cant cancel / change because already use so long, very inconvenient) - there was a link posted in lowyat also - where you key in your phone number - and if you see your IC there, then you know its leaked