To Julsik, Poor little thing and Mr_eastcoast2k5, I 150% know where you're coming from, I'm on my 2nd iphone 4s in 2 months after 3 weeks of sheer agravation and CURSING the day I downloaded ios6, I FINALLY made an appt at the Genius bar for this past Sunday:
went to Genius bar and they did a "different type of restore" as my Siri stopped working on Sunday also, I begged and pleaded for a new out of the box phone and he said if I can't figure it out, I'll give you one, first thing he did was take the plastic cover I put on the phonescreen myself, no more muting by ear and the screen goes dark, not dim, dark, in seconds while on a call, IDK if this is true but he told me and kind of showed me that some iPhone 4S models come with the screen cover already installed to avoid the sensor issue which I experienced b/c I automatically covered my phone with a screen protector before I took it out of the Fed Ex box. He wanted to take the preinstalled screen cover off to show me, but I said "No thank you" and now that I look closer at the device I can see it. After he did his thing he brought the phone back to me, I tested it and immediately noticed that there was a difference, he also restored my ios6, I now have options that I didn't even know existed, now I LOVE ios6, but my keyboard shortcuts were gone , no good, unacceptable were my words, he sent another employee into the back and she came out 10 minutes later; ALL keyboard shortcuts present even ones from years and 2 iphones ago that I forgot about. My phone is like new now, turns out my restore file in itunes is corrupt. I woud've never thought my restore file woud be corrupt (see my username), didn't even know that existed so the 100 times I performed a restore was just a waste of time. I said what happens if I have to resore? They said come back and your wish for a new phone might just come true. Point of my story is to take your device to the Apple store; even if you're not covered they'll diagnose it for you so you know. Best of luck!