Comment by sangnoir

> Would it be possible to fool the triangulation from the device, by arbitrary (or intelligently) delaying the mobile radio signals?

Not without messing up your ability to make and receive calls. Cell towers use precise timing and power-level measurements in order to do things like decide which cell-site is best, and to hand-over your call from one tower to the next without breaking your call or glitching.

Edit: Even if you were to play around with timing of responses of the radio signal, you have no control over how it radiates in free space. The time-delta between reception of the same signal by 3 towers at known locations is enough to triangulate your position. Maybe a unidirectional antenna pointing to just one tower might work, if there are no other towers within the beam behind it and no sideway leakages.