iPhone 4s 6.1.1 problems - Voda UK

My original firmware on my unlocked 4s iphone was 5.1.1. On that firmware I had good call quality, battery life was decent (approx 2days) and generally the phone behaved itself.

Then 2 weeks ago I upgraded to iOS 6.1 and I started gettting bad battery drain and the phone needed charging on a daily basis.... Also, there was no change to the call quality and the phone did not drop calls.

Then yesterday I upgraded to 6.1.1 - What a mistake that was. Battery life is still as bad as 6.1 if not worse..... In 15hrs the phone is at 20% and has only been lightly used. More worrying is the call quality. For me, the call quality has degraded. I have twice now experienced a cross call! And on three maybe four occasions when I dial a number, I have experienced call break up so bad that I have had to end the call and redial. The call break up sounds as though one is in a tunnel and there are echos and the voice just degrades into unaudible interference.....

My conculsion from this is that iOS 6.1 to 6.1.1 has fundamentally altered the way my phone performs and I am not pleased at all. Surely the performance of a phone should not degrade as a result of an iOS update?

Apple, please kindly sort this out as it's embarassing....