[hamoid]

A faraday bag probably helps to reduce the tracking: http://killyourphone.com/

[justincormack]

Thats an art project about raising awareness. Just turn the phone off.

[j_s]

Just turn the phone off hasn't been enough for 10+ years.

http://www.washingtonpost.com/world/national-security/nsa-gr...

  By September 2004, a new NSA technique enabled the agency to find cellphones even
  when they were turned off. JSOC troops called this “The Find,”

[stefantalpalaru]

... by removing the battery.

[kefka]

Some paranoid peoples claim there are batteries inside SOICs that still can provide data.