Add me to the list. Within days after I upgrading to iOS 4.3, people couldn't hear me on the speaker or regular mic or even with a hard-wire headset!! Often, people could hear me for maybe the first 10-15 seconds. I tried hard resets etc.
I took my phone to the Apple store after spending an hour trying to communicate with clients (I'm self-employed and this is my only phone!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
). I had to use clients' land lines and refer to my address book on my phone for numbers. When I arrived at the Apple store (Emeryville, CA, USA), my phone worked fine! They ran diagnostics and said it was ok and there was no record of dropped calls, which WASN'T the problem, so so what. They told me to replace the SIM card at AT&T because a bad SIM card can cause that problem (huh?), so I walked across the street to AT&T, which replaced my SIM card on the spot for free. It worked for about 7-12 days, until today.
This morning, after putting one client on hold and taking another call, then switching back and forth a couple of times, the problem reoccurred. For an hour or so, no one could hear me on the speaker or regular mic with incoming or outgoing calls. I borrowed my girlfriend's phone and called my clients back.
Apple seems to "win" by proving that my iPhone passes Apple's diagnostic tests. Good for them. The phone aspect of my iPhone is NOT a luxury and is my only phone. Good for Apple for "winning" the argument.
I'm seriously considering switching to a Droid phone. The only problem is I like MobileMe to sync my calendars and address book over the air to my Mac. I think I can work around this by switching to a gmail address and use gmail's calendar and address book, both of which sync over the air with iCal and Apple Address Book. Any ideas?