Sorry to bother but what settings on Vizio Tab and what app and settings are you using on your cell to achieve a wifi tether? Not a forum out there that i have read where this was achieved, hence the out cry for root with this tablet.
Sent from my VTAB1008 using Android Tablet Forum
Well, my Droid 2 Global was rooted (until the recent Gingerbread update but I am working on that!
I was using an app called Wireless Tether (Barnacle, another tether app was tried first but did not work for me) and no special settings aside from the security which is WPA2 and from a prior post it sounds like that may be the key. Someone else posted that they read somewhere that you need to use WPA to connect which I did not know, just happened to set it up that way.