These are simple methods in receiving free calls to your cellphone using Google Voice. First, you must make sure you have a google voice account (obviously) and when you do, your carrier must support some type of “unlimited-calling” option such as “MyFavs” for Tmobile or “AList” for AT&T.

T-Mobile
Simply add your google voice number to your MyFavs and any call placed to your google voice number will be dialed from that number.

AT&T
Add your google voice number to your A-List, same effects will occur.

If you do not have google voice, this will not work. Make sure you give your friend your google voice number instead of the number provided by the carrier or it won’t work either. Good luck!