While Apple recommends only using Face Time while connected to a wireless Internet connection, Hangouts deals much better with standard cellular data rates.In addition, voice calls to other Hangouts users are completely free.You are able to score the call afterwards, and depending on what hardware you are using to make the video call, the video can be transmitted in HD.
If you have an Android phone (five of which you should check out), you should also have a Google account — it’s the key to all of the company’s awesome services, including Hangouts.
Keeping your address book in order lets you merge all of your message streams into one easy-to-follow feed.
Hangouts is Google’s service for both real-time text chat and video.
One of the best things about it is that it’s massively cross-platform and linked to your Google ID.
Viber started out as a text and audio messaging app, but quickly realized that they would need to add features to compete in a crowded marketplace.