Hi guys! I remember that the story alike was concerning the iPhone 4S and this Russian navigation system, and now Sony announces the same. I want to purchase one of those Xperia smartphones in the future so can I make it safe from spying on me?
The transmission is synchronized with the radio waves that you want to interfere with the signal frequency, thus preventing the transmission of the device into the area around the device.
The second point, before buying, is the distance or radius of what is supposed to be covered by understanding. The JAMMER power tile is measured, so more tiles have signal jammer plus distance and increased range of motion.
The story you have mentioned was indeed about iPhone 4S and its GLONASS support. It is quite dangerous when your smartphone has such powerful tracking system with 55 satellites (GPS + GLONASS). So to maintain your privacy and avoid being tracked by your Xperia with GLONASS support may become your top priority after you buy any among Xperia S or Xperia Ion.