(Intentionally) blocking the Phone's signal

[therob]

@jftr

If you want to hide your phone from any spy, you can put it in a Faraday’s pouch. Have a look at http://killyourphone.com/. I’ve sewed such a pouch using this shielding fabric and it works remarkably well.

But be aware only using it in “flyghtmode” makes sense, because otherwise (every) phone will try to increase sending power to regain contact to the sending antenna of the provider and that would contradict the aim of beeing shielded.
Plus: It will increase the battery consumption (I think drasitacally). Thus it only makes sense while beeing in flightmode and TRY to make it as unseeable as possible from the surrounding.