This article lists the minimum system requirement to use Yahoo! Messenger for Android with Video and Voice.

Requirements for Basic Messenger application:

• Operating System: Android 2.0+
• Internet Connection: At least 3G, works best on Wi-Fi networks
• Free space: Approx. 10MB (2.7MB for the basic application, 5.8MB for video and voice plug-in)

Requirement for Video Calling:

• Android OS 2.3 or above (OS 2.2+ for MyTouch 4G & EVO)
• Yahoo! Messenger 1.5
• Front-facing camera for best video calling experience
• The other user needs to use Yahoo! Messenger for Android, iPhone, or Windows PC