Truphone (VOIP application which supports almost all mobile Systems like Symbian, iPhone and iPod Touch, Android and BlackBerry) is giving away 12 hours of free calls to USA on the day of thanksgiving.
During 12 hours on Thanksgiving, all calls made to US landlines or mobiles, using Truphone, will be completely free. he Free Thanksgiving Calls will be running on Thursday, November 26th 2009, between midday and midnight GMT.
Read more here from the official site