The most popular Voip service,Skype improved better signal quality and more stable video-calling. The new Skype 4 now lets full-screen video calling.Skype 4.0 also added built-in bandwidth manager which ensures for video calls even with slow internet connection. Now Skype 4 users can keep track of multiple conversations,flit between voice and video calls to friends and family, or instant-messaging and text chats,switch more easily between calls.