If you use the Voicemail in the Phone App, it wont keep the radio connected through bluetooth if you try to double click out to ipod.

if you call your voicemail pause the message and then double click out it will stream through. But quality is definetly not clear!

 

this will kill your voice minutes unless you have unlimited atm as it is still in-call while paused afaik.. maybe only do it after 6 pm during unlimited eve/weekends lol..neat trick though