HotDog: I now comply with the rules as a pax but can not understand why one must not use mobiles untill disembarkation after engine shutdown?
Different airlines have different rules or levels of hysteria. BA for example lets you switch on at engine shutdown.
The funniest was QF's stance for a period. They used to be a particularly hysterical "switch off before boarding, switch on after disembarkation" airline. When they introduced their CityFlyer super-duper business service they allowed use of phones until doors closed, while maintaining the previous rule for all other flights. Crazy. They've brought the others into line with CityFlyer now.