when i first got my f900 and was using it with my nextel, about 1 out of every 7 or 8 people i talked to said that there was a helicopter sound coming from my phone, well i switched over to a Verizon blackberry before i ever figured out what the problem was and has never had the problem again. now one of my co-worker has a U31 and after months of no problems, his started making the same noise with both his sprint samsung phone (dont know the model number) and his wife's Iphone 3GS , except for that it is happening every time and it a lot louder, it literally sounds like the traffic guy on the news up in the sky flying around. has anybody else ever had this problem and maybe a remedy.

thanks

really, nobody else has experienced this?

Yes, I've been experiencing this same problem for about 3 - 4 months now. Same scenario as you. It worked great for the first 6 months, then every once in a while, now all the time. Wish someone could find a fix