I have the Motorola S9 headset for my 8120 with 4.5 OS. It works like a champ (worked fine on 4.3 as well). It has no problems connecting to my Berry and sounds great. It's a little less comfortable than soft eargels or clamshells, but I think it's worth it for the ability to be pretty bouncy and active and wireless while rockin out! voice works well too. Got mine for 40 bucks on ebay.