Here’s how to protect your phone from the Stagefright bug if you’re using Google Messenger (the default SMS client for Android 5.0+):
How to Protect Your Android Phone From the Stagefright Bug
Author: Greg Baugues - Published 2015-07-29 02:50Disabling Auto Retrieve MMS will partially mitigate this vulnerability ahead of the official patch release.
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All MMS media files will require a click in order to be viewed, but disabling this feature will prevent an attack from automatically executing on your phone. Turning off this feature does not fix the exploit entirely. So long as the bug exists, your Android device remains vulnerable and can be hacked if a malformed media file is downloaded by clicking on it. This vulnerability will not be completely fixed until a patch is released for your device, but this intermediate step can help mitigate the threat in the meantime.
If you’re using Google Hangouts as your default SMS client, here’s how to protect your device from Stagefright by disabling automatic downloading of media files sent via MMS: