Some additional information on this, including how the system has been in place since 2010, with the recent change being that you're now (somehow) getting text

Some additional information on this, including how the system has been in place since 2010, with the recent change being that you're now (somehow) getting text messages without registering your mobile number: http://riyadhbureau.com/blog/2012/11/saudi-women-tracking http://riyadhbureau.com/blog/2012/11/saudi-women-tracking