Skype makes staying in touch with all your contacts. It stays informed about what's happening with your friends through video and voice calls and instant messaging. It is no matter if you are on a PC, Windows Phone, Mac, tablet, iPhone, or Android device, Skype keeps you connected and always available. Once you sign in, the app is always on without draining your device's battery, so you can take calls any time. It features exchange instant messages with all your Skype, Messenger and Outlook.com contacts, call any phone quickly and easily from Skype, all Skype-to-Skype video and voice calls are free, your messages are delivered straight to you no matter what you're doing, and snap your IM or video call window left or right so you can do more things while catching up.