I'm with aewaite17 - this is how I behave on flights. I follow the rules and always have my devices off for take-off and landing, and they are always in flight mode before I even board the plane.
I fly a fair bit between the UK and Spain and pretty much always see people on their phones and using them when the plane is taxiing or taking off.
Do the cabin crew ever pull them up on it? Even when they walk by doing the seatbelt check. Not in my experience. That is frustrating.