Came across this today Boffin unlocks cars with text message - Yahoo! Cars not sure if it is a particular vunerabilty for Mercs, but I always used an additional handrake/gearshift lock for years. I appreciate my car has an alarm but now use a locked steering wheel bar. Whilst not totally foolproof I feel it is an additional disincentive particularly being visual, to potential thieves who may choose easier targets. The text message scenario would leave contents vunerable though.