Finally some people understand that mobile phone, wifi and bluetooth runs on different frequencies and won't interfere with the aircrafts instruments.
Do note that it is still the discretion of the carrier, pilot or crew if you are allowed to use electronic devices while inside an aircraft. Better follow their instruction unless you want to get escorted off by marshals or airport security off the plane. Most don't mind unless you are obnoxious or just loud ;)
Infographic from Rappler.com
More info regarding the memo here: PIA Link