Synchronica makes a cellphone security system that will erase and lock down your cellphone when you report it missing. They will also trigger your stolen phone to emit a high pitched scream. According to the site, 10,000 mobile phones are stolen every month. From the site:
"According to industry sources, it takes on average only 30 seconds for someone to notice that their phone is missing, compared to an hour for a wallet or purse", said Carsten Brinkschulte, CEO of Synchronica. "Using our service, crime victims can be reassured that their information is immediately removed from the stolen phone, along with the satisfaction of annoying the thief with a screaming handset."