Oh, jeez. I just found some unfortunate woman's ID card and bank card in the snow outside by Gullmarsplan. Handed both to a security guard. I hope she starts having a better day, it's got to suck to lose both your ID card and bank card at the same time.
Being able to look up a phone number from a person number is not guaranteed, I don't think. I have to figure there's a reason why I've literally never received an unsolicited call on my Swedish phone number. Besides, the security guard probably knows more about that than me. :)