I have a Galaxy 10.1 Tab (ics) + Galaxy S2 phone.
I've recently been using 'Tablet Talk' to text and, make phone calls from my Tab.
1/ Simply download Tablet Talk to both Tab and phone.
2/ Connect both via Bluetooth or Wifi
And away you go..
The Galaxy S2 can also acts as a mobile wifi 'Hot Spot' for your Tab.
Hope this helps.