1. This is not a launchable app on its own, you need to install Yahoo! Messenger to enable the call features2. To call, press the menu button in a Messenger conversation and tap the voice or video option
3. Video is only supported on Android OS 2.2+ (except for MyTouch 4G & EVO 4G where OS 2.3+ is required)
4. Yahoo! Messenger 1.5 and higher
5. The other user needs to use Yahoo! Messenger for Android, iPhone or Windows PC
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