Duo Voice is a Free Calling app that offers high quality phone calls locally and abroad. Use this Wi-Fi phone call app and enjoy global calls with any real phone number without worrying about expensive costs! Call for free and get in touch with people around the world! - New user LIMITED offers *: Get 500 credits after registration! WHY USE DUO VOICE: • 100% FREE calls, call any kind of phone and anyone you want. • International calls, easily reach more than 230+ countries. • N