Download this app if: you want to make video calls.
Android App Tablet Review: Tango Voice & Video Calls — Though Tango Voice & Video Calls for the Android Tablet is a bit buggy at times, it's still on par with other similar video-calling apps in the Android Market. Before you can get started, the app asks for your name, email address and phone number, so that you can easily sync-up your...
Make free voice and video calls. Send free text messages and share photos, videos, and status updates.Swipe profile cards or join a trending conversation to make new friends near and far. Over 300 million people use Tango to connect with people nearby and around the world.
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video calls for free! — This app allows users to call, write sms and make video calls for free, with other Tango users. You can also send and receive VIDEO messages, and the app automatically detects your friends using Tango. Cons: it is not so well known, yet, so much as Skype for example...