The thing now is not to let anyone have from you. There is a scam going on at the moment where someone calls you claiming to be an engineer and asks you to key in the numbers you quoted above. I dont know what they do with these numbers but its not good.!!!
Fortunately, this is an email-propagated urban legend derived from an American land-line scam :
see
http://www.tafkac.org/ulz/90pound.html
Noting down your IMEI number is a good idea though - just in case your phone goes for an unauthorised excursion...
m.