IPCall : Cheapest way to callBy AnitaSofts
From Android 1.5 to 2.1 Use a Betamax voip`s account service to call(CallBack) worldwide : 12voip, actionvoip, budgetsip, calleasy, dialnow, freecall, internetcalls, intervoip, jumblo, justvoip, lowratevoip, netappel, nonoh, poivy, powervoip, rynga, sipdiscount, smartvoip, smsdiscount,telbo, voipblast, voipbuster, ...