I turned on the WIFI on my 4g phone the other day so I can WIFI in the car with the Nexus 7. I was using the Google voice recognition and the navigation, I wanted to test it out so I could if I can turn off the GPS on my phone plan. It worked nicely until I deiced to go to 2 maple street. Everytime I said the word "two", it thinks it was "to" . I didn't try the word four but I'm expecting the same results. Anybody know how to work around this?

I've just updated this as I had two different model headsets to test with. I'm starting to think I have a defective Nexus unit.
I’ve tried a couple of these Plantronics Bluetooth plt 510 and Model 330 bluetooth head sets ear piece that I have been using with my iPhone and Windows XP machines around the house. I typically only use them for phone calls either will the default phone or a google voice phone app. On the Nexus 7 I can get them to pare but when I make a phone call and redirect the sound the earpiece and it begins to screech like an AM radio next to a neon sign with a short in it. Ok so I’m showing my age now. For those of you that don’t know what AM radio is, please see Paul Harvey. 

I have not had the opportunity to test any other Bluetooth ear pieces besides the PLT 510 and Model 330 yet. I’m wondering if anybody has with the Nexus 7 and a compatible google voice phone app.