From an article in the Washington Post:
“A quite sophisticated text messaging network has sprung up,” an “insider” told the Scottish Daily Record. “If [Prince] William is spotted anywhere in the town then messages are sent out” on his admirers’ cell phones. “It starts off quite small. The first messages are then forwarded to more girls and so on. It just has a snowball effect. Informing 100 girls of his movements takes just seconds.” At one bar, the prince had to be moved to a safe location when more than 100 “lusty ladies,” so alerted, suddenly mobbed the place like cats responding to the sound of a can opener.