ats:
OpenBSC being Harald Welte's free-software GSM base station implementation.
This can mostly be summarised as "it works", but section 3.6 is interesting...
If you've got a smartphone with GPS, "RRLP enables the network (or anyone claiming to be the network) to obtain the current GPS fix of the MS without any form of authentication."
ats: I don't very much like having my picture taken...
Erm, that sounds kind of grumpy. I don't mean I object to this particular picture, just that that explains why I'm peering at the camera like that. ;)