Ok, pretty weird, I had perfectly working unlocked 1.1.1 iPhone. Couple of days ago I just couldn't call or answer for incoming calls anymore.

Thing is, my iPhone rings when someone is calling but if I press answer line is dead, none the caller or I can't hear anything - nothing. If I try to call I can't hear anything after I press call but my friend phone is ringing.

But as soon as I switch to speaker everything works. I can answer, call etc but ONLY when using speaker. So it seems that mic/speaker is working just fine.

I tried to virginize my baseband with oneSIM, after that restored and activated/unlocked again but didn't help. I even upgraded to 1.1.2 but same problem occurs.

Seems to me that I have hardware issue, something is totally broken. Any idea what parts number should I swap/order?

Solved
I just plugged headset on/off and it is now working. Really weird... but Im happy it is not iBrick anymore.