Free Calls with T-Mobile

If you use grand central (http://www.grandcentral.com/) and add your contacts to there and you have a myfaves with tmobile you can have grand central call your cellphone then connect you to the other person through their website. it is always the same number that calls your phone so if you add that as one of you 5 numbers then you can call anybody for free. you just need to be near your computer. can also work if you dont have long distance because you choose the area code of the number that calls you.