Hi, I'm great and looking forward to getting back to the UK in a couple of weeks.
GSM/GPS jammers are getting everywhere, they are used in resturants and cinemas over here.
I have a GPS/GSM tracker it is about the size of a packet of cigarettes and just requires 12V tho it has it's own internal battery which will last it for about 2 weeks after a full charge, it has various functions that can be activated/deactivated by a txt message from a gsm and will send a txt message if it enters/leaves a user defined "geo-fenced" area. It can be jammed tho either by the GSM or GPS side but it does store it's data and will download it to you the first chance it gets. I have used it to "asset track" and finaly aprehend the subject and that was after it had been all over Europe.
That device is intended to defeat the device I use Tracker works on or around the 130MHz to 140Mhz band.
On a simillar note my MG ZT has a BMW based TV/Satnav/GSM system in it, recently I was reading the messages over the CAN bus and was surprised to find that the last messages sent AFTER I had switched off the ignition were position data from the GPS Sat Nav to the mobile phone to transmit the location of the car  Sons of dogs come hither and get flesh
Clan Cameron