How to take screen shot in Android
Taking screenshots on Android Ice Cream: press both Power + Volume Down buttons together.
Taking quick screenshots on Samsung Galaxy series: Press ...
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HTC One uses a compass sensor to help you find the direction. When compass in not available the phone shows notification. Disable compass warning on HTC One by doing as follows:
1. Open "Settings" app
2. Go to "Location"
3. Unmark "Compass Warning" to disable notification (mark it again to enable the feature)