HTC Evo 3D bluetooth phone audio not working

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http://androidforums.com – Any suggestions for getting call audio sent to bluetooth headset? Carrier is Virgin Mobile, btw. Motorola S10-HD bluetooth headset is properly paired. Audio works fine while streaming music, but the handset will not send phone call audio to the headset. In the settings for the headset, the "Phone audio" box IS checked. During a call, the speakerphone button becomes a drop-down menu for choosing either the loudspeaker, the regular phone audio, or the headset. Choosing the "headset" option still does nothing, though switching between regular phone audio and the speake (General)