[folks, we've been spammed - shuwang who started this thread embedded a spam link into his signature so I've deleted his post that started this and then just quoted his message here - cliff]
When the flight attendant say, "You may now use your electronics," what kind of electronics can I use? Can I use a phone? If I had an iPhone, could I be able to use the internet or something? And why aren't you allowed to use electronics sometimes when you fly on a plane anyway?
most of the major airlines have guidlines on their websites. Mobile phones will most likely have problems working at the cruising height and speed of an airliner due to doppler effect.
Takeoff and landing are crucial phases, so they want to avoid potential interference from electronic devices so that's why they ask you to turn them off. Personally I don't want the plane I'm on to crash.