Iphone4 is not discovering bluetooth devices

My Iphone4 will not discover any bluetooth devices. It used to connect to my car other iphones but now it wont. Ive updated to IOS5.1, I've reset, restored, tried various things recommended by O2 and Apple support and finally the Apple store replaced my phone but I still cannot connecting to any bluetooth devices. My husband who has exactly the same Iphone can connect to all our bluetooth devices and I suspect its some setting that I need to change.
Please help!

You probably need to delete the pairings and re-pair the devices. The device you want to pair with must be in discoverable mode. Consult the manual for the device to find out how to do this.

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