Here's how you can download the Yahoo! Messenger app free for Android devices.
1. Go to the Google Play page for the free app Yahoo! Messenger.
2. Tap the Install button.
Here's a description of Yahoo! Messenger:
"The official Yahoo! Messenger app for Android
- Free Voice & Video calls (Beta) †
- Chat with Facebook friends
- Free international SMS ††
- Share Photos & Video
- Chat with Windows Live friends
- Stay online on Android & PC at the same time, receive messages only where you are active"