I turn off my gps transmitter by default,i only turn it on when using the navigation feature..my data connection as well it's off when I want to check email,I'll turn it on then back off.so my phone cannot detect speed without either of these disabled it needs at least one to do that.i do this for battery life,hardly anyone leaves there gps on that I know...so it's easy to get around anyway,and SMS texting still works when data is off,because you still have your cellular radio enabled.they can't disable that or your phone wouldn't work when moving,if they do that I'll get rid of the phone because it's useless at that point..