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I have a Samsung Galaxy S2 which has just received the upgrade to Ice Cream Sandwich (I'm on T Mobile in the UK if that matters).

I have a set of bluetooth headphones. They worked fine before the upgrade, they would be detected by the phone and would pair with it without my having to enter a PIN code.

Since the upgrade to ICS, they no longer work. When I turn on Bluetooth, the phone detects the headphones but won't pair with them. When I try to pair them I get an error message that there is an incorrect PIN entered or an unknown PIN.

I know what the PIN is (0000). The problem is, the phone doesn't give me an option anywhere I can see to actually input this to allow the phone to pair with the headphones.

Samsung have advised me to do a factory reset of the phone, which I've done, but the problem remains. ICS is still on the phone and I still have the above problem.

Can anyone help?

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Did you put the headphone in pairing mode before pairing to the phone? – droidgren May 1 '12 at 10:30
Thanks for your answer. The headphones are just or or off. I press the button on the headphones, a blue light flashes. At this point the phone can detect the headphones as a Bluetooth device. Prior to the upgrade I would then be able to pair the two, now I can't as I have described. – Jules May 1 '12 at 12:19
Which model of headphones? Any link or instruction manual? – Sparx May 1 '12 at 13:07
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I had a similar bug with ICS 4.0.3. Seems to be fixed in 4.0.4. – Craig Stuntz Jun 5 '12 at 11:54
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Consider making your comment an answer, to have it accepted, so that future readers can find this as solution if faced with the same situation as you. – Zuul Aug 20 '12 at 21:28
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