So here is what I did... I now have a working VOIP phone service via my T-Mobile Tab..
-- Get the hacked Skype App (allows 3G calling) http://www.megaupload.com/?d=156KWZVH
-- Get Google Voice from Market
-- Go to skype.com and setup an account
-- Order a Skype Internet Number (it's $30 for a year right now -- normally $60)
-- Add a Skype calling plan ( I went with $2.99 a month for unlimited calling)
-- Set Skype to display your Google Voice Number (Caller ID Settings)
-- Set Google Voice to forward all calls to your Skype number
-- Go into Google Voice App and set it up to use your Skype number for voicemail notifications.
It works and it works pretty darn well...
--Incoming and outgoing voice capabilities
--Unlimited calling in the US and Canada for $2.99 a month
--With 3G data plan you always have phone functions to dial out and receive
--Use Google Voice for SMS messages and you only have the one number.
--If you don't want to use the Google Voice number for SMS then you will have 2 numbers. The one that came on your Tab that is used for SMS/MMS and a number for phone usage.
--Price for this to work per year amounts to $66 ($30 for the Skype number and $36 for the unlimited plan) Not really a con if you consider this is the total cost for a year of unlimited cell (VOIP) calls from you Tab
--If you use Google Voice for SMS it does not do MMS
Here is how it works...
When someone calls your Google Voice number it forwards it to the Skype number and the Tab rings...
When you call someone it displays your Google Voice number...