I don't think too many people realize that allowing cell-phones wouldn't do anyone any good anyways. I have enough trouble getting cell-phone reception on the ground, let alone at the minimum, 7 miles from the nearest station inside a metal enclosure... and thats best case scenario. Most airline flights don't spend too much time over densely populated regions or highways, so the nearest tower may be dozens or hundreds of miles away. You're also travelling at hundreds of miles per hour... theres no way a phone could "lock on" to a tower even if it could get a signal.
The only way for it to work is if cell phone "towers" were installed in airplanes. And I know that if that happens, I won't be flying on those airlines... the last thing I need is to be in a confined space for hours on end with 200 strangers yelling into their cell-phones "SORRY, ITS A LITTLE LOUD IN HERE, I'M ON AN AIRPLANE.. WHAT'D YOU SAY!?"