Yes - ring it and ask them. You could pose as a mobile phone sales agent and offer them a great deal!
Otherwise, not for ordinary citizens - the police or intelligence services have ways (which consist mainly of asking the phone company). Even then a PAYG mobile may have no address associated with it anyway
anyone fancy doing this on my behalf, i'm no good at fakin it. You've probably guessed i am in a difficult situation and need answers to move on......! A surname and a home address would be nice.I have a Christain name