chipsoars wrote:
On Mar 4, 4:37 pm, "Peter" wrote:
What is the maximum altitude (about) when the mobile phone becomes useless?
PeterK

I've had it ring at 2500'agl at which point I told whoever (my wife
and curtly too) that I was busy flying and then shut it off (I forgot
to shut it off prior to launch). If many consider it unsafe to drive
and talk, why do it in the air?

There was a study* done on cell phone use in airliners which determined
that an average of 1-4 calls are made on each commercial flight in the
northeast US. If you can get a signal at 35,000 feet inside an aluminum
spam can, I'm sure you can get one just about anywhere in your glider.

* Briefly mentioned on http://www.post-gazette.com/pg/06060/662669.stm , I
didn't find the original study.

--
Michael Ash
Rogue Amoeba Software