00 44 781....
 

Can anyone please tell me which UK mobile phone plan this is? Is it a pre-paid card?

Thank you.

more digits needed - search on

http://www.magsys.co.uk/telecom/codelook.asp or

http://www.numberingplans.com/?page=...is&sub=phonenr

those tell you which was the original network, and won't help for ported numbers

Thank you, Andy.

Your title has clearly been well-earned.