If you own Samsung Galaxy Tab and have been looking for a cell phone then you might be interested in knowing how to turn a Samsung Galaxy Tab into a fully functional phone.
There has been released a method by XDA Senior Member almaqdad which enables Samsung Galaxy Tab to make calls as well. There are available numbers of installation methods as per the different ROM.
The method will work only on 3G version of Samsung Galaxy Tab 10.1 or GT-P7500 version with device running newest stock ICS ROM and derivatives CyanogenMod9, or CyanogenMod 10. After that, the only thing required is to download the appropriate files and flash them in recovery.
So far there has been reported only one issue and that is of dropping the 2G in order for device to make calls.
Source: XDA developers