Myth #1: Mobile phones casue gas explosions.

Why am I allowed to take my mobile phone on a plane when I could cause the plane to crash if I turn it on while taking off or landing, or I could cause an explosion if I turn it on while walking across the tarmac? Surely they should be completely banned from planes, if this is the case?

...yet I can't take on my nail clippers.

(I'm tired of pointing out the obvious to people in petrol stations and airplanes. Think people, think.)