I have two iPhones (4 running on iOS 4.x and 4S running on 5.1.1). I have just started using the 4S and ran into this issue, it won't pair with any bluetooth devices I have, not even with the iPnone 4. It is reidiculous that Apple simple does not care about it and keep throwing us at othe rocmpanies asing for support on their devices that do work and are compatible with anyone else.
Before complaining about Apple's stupid phones, I carefully tested all my bt devices connecting them to each other. I have devices manufactured by Dell, Sony, Samsung, LG, etc, everything works as expected but Apple's. What else do we need to do in order to get some respect from Apple?
Same thing with the battery on the 4S, is gets depleted in half the way as compared to the older iPhone 4, simply ridiculous.
Apple, make your products work instead of spending money on fancy TV campaigns!!!