Telling Apple is one thing, but I'm trying to see if "it's just me". If so, then I will go to the Apple store and try to get a replacement.
Definitely not the proximity sensor. Happens on BT calls as well. I did install a few more apps right after the upgrade. I wouldn't imagine an app causing this issue.
I did restart the phone. Since it is intermittent, it's hard to pinpoint.
I was most curious to see if I was the only one. I guess I am so far.
I will be near the Apple store tomorrow and I'll stop in and see what they say.
JKrutch: I just got my Iphone 3G replaced with a factory new one (due to a crack in the casing). Although it worked excruciatingly slow after being upgraded to OS 4.0 (those problems have been detailed at length elsewhere), the calls were fine. Literally right after I upgraded to 4.0.1, I started having the intermittent one way audio issue. Sometimes it was fine, sometimes my calls started fine then deteriorated, and sometimes no one could hear me from the start. It seems to be totally random when it happens.
Did you ever figure out what happened to yours?
Are you guys saying the other party can't hear you at all or can't understand you clearly?
There are a lot of people having issues with Bluetooth (myself included) where your voice will sound extremely muffled to the other party. It's intermittent and definitely doesn't happen on every call. Pretty frustrating if you're on your iPhone 4-6 hours/day for work though!
Here's a link to that thread. The problem isn't getting much press on this forum however.
http://discussions.apple.com/thread.jspa?threadID=2481487&start=0&tstart=0
Same issues here!!! Bluetooth audio is muffled for the person on the other side of the call. This seems to be widespread!!!
Here's a video that actually demonstrates the issue with the muffled sound:
http://tap4.us/z3e
Apple really needs to fix this!
same problem here. 4.1
On the phone with ATT now and they said it's the mic. Explained that skype, FaceTime, and voice memo all work fine, but they still want me to have apple check it out.
I was getting ready to wipe my device as a last resort by sending it in. So I pluggged it into my MBP and synced it. Before the restore process, I figured I'd try it one more time and sure enough it's working now. So all my phone needed was a reboot then sync.
Hope that works for others.
Still having the problems. Even updated to 4.1 with no luck. Gonna try a hardware swap with Apple now.