I have a Droid X and very rarely use it as an actual phone. Since I refuse to have two data plans with Verizon would it be possible to use a XOOM as my phone with a bluetooth headset? No, I wouldn't want to walk around holding it up to my ear.
If I remember correctly the Galaxy Tab can be used as a phone in Europe, but the function was disabled in the US. Heck, I even checked out the Galaxy Tab at Verizon and they had to assign a phone number to put it on the network. BTW, I think that disabling this feature was very "Apple like", which is why I got rid of my iPhone to begin with.