the 660x can use BT 1.2 devices. I use a Jabra BT250v which is 1.2 compatible. Try moving your phone closer to your headset or keeping it on the same side of your body. Also, if you are in the viscinity of an 802.11b/g network or a 2.4gHz wireless phone, it can cause interference. Otherwise, it just may be that your headset doesnt work well with this phone, but that has nothing to do with 2.0. What stack are you using and what stacks have you tried?

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XV6800, Aliph Jawbone