Ah, the power of the XDA-Developers modding community never ceases to amaze me.
XDA-Developers forum member ClubTech has released a method that will allow AT&T, Bell and Rogers Galaxy Tab users to enable voice calling! The method, however, doesn’t work on T-Mobile’s Galaxy Tab due to T-Mobile’s IMEI blocking. Of course, there’s already a method for that.
Have your AT&T, Bell or Rogers Galaxy Tab handy? Want to make and receive calls on it? Well, make sure to hit up the source link below and get to working!
Source: XDA-Developers