A:
The surface 2 is basically the same machine of the surface 3. In fact you can buy the same combination of processor and RAM. The difference thought is huge. Surface 3 is the perfecting of a great idea. It has a 12'' screen, it's lighter, it's way thinner, or has an improved pen, an improved charger connection, a perfect keyboard, better speakers, perfect stand....
You cannot make phone calls, these are not phones but full PC's without a modem. Imagine what you could do if your iPad was as powerful as you desktop PC, but with a 12'' screen? Buy a surface 3 to find out.