Hangouts brings one-on-one and group conversations to life with photos, emoji, and video calls for free. Connect with friends across computers, Android and Apple devices. Brought to you by GooglE SKYPE: Free voice and video calls to anyone else on Skype, whether they’re on an Android, iPhone, Mac or PC, as well as IMs to your friends and family, no matter where they are. VIBER: Viber allows you to text, call, and send photos and video messages worldwide for free to over 200 million users using 3G or Wifi. Viber is available for Android, iPhone, Blackberry, Windows Phone and many more devices and platforms. On Viber, your phone number is your ID. The app syncs with your mobile contact list, automatically detecting which of your contacts have Viber.