Phone Wifi Jammers

This is obviously a joke, but still, some people want to block their cell phone signal without any phone signal jammers, and no signal is more polite or acceptable than not answering the phone or refusing calls to.

(1) Important meetings where they don’t want to be disturbed.
(2) On an airplane with an old-fashioned phone that doesn’t know how to turn on airplane mode.
(3) Being chased by a debt or being borrowed money do not want to answer the phone.
(4) Going to sensitive places and not wanting to answer the phone or be located.
(5) Casinos.
(6) When having sex with your lover.
(7) when you quit your job and want to relax.