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Verify Your Settings

First, ensure that your Android phone is set to auto-rotate when you change the orientation of your phone. Tap 'Settings' and then 'Display.' Verify that the 'Auto-rotate screen' option is checked. Next check the animation setting, as this setting can sometimes affect the auto-rotation of some websites and applications. Tap the 'Animation' drop-down arrow and select 'All animations.' If these options are set correctly, keep troubleshooting.

G-Sensor Calibration

Android phones need to be re-calibrated every so often to ensure that auto-rotate works correctly. Use the G-Sensor calibrate function for this. The G-Sensor is an accelerometer that measures the forces acting on it and allows for auto screen rotation and other device enhancements. To re-calibrate your Android phone, tap 'Settings' and then 'Display.' Tap 'G-Sensor calibration,' and place your phone on a flat, level surface like a table or counter top. Tap the 'Calibrate' button and wait for your phone to re-calibrate. Tap 'OK' when your screen reads 'Calibration complete.'

Memory Leak or Overload

Sometimes the auto-rotate function does not work if your phone is experiencing a memory leak or is running sluggishly. Close all unnecessary applications and Internet windows, and try to auto-rotate again. If that does not work, turn off your phone and turn it back on again to refresh the Android operating system. Removing and replacing the battery can also help.If the auto-rotate problem persists, clear your System Data cache. Tap 'Settings' and then 'Applications.' Tap 'Manage applications, and scroll down and select 'Market.' Tap the 'Clear cache' button. This should give your phone extra storage space and help its performance. Restart your phone after clearing the cache.

Your Phone's Case

If you use a phone case, take your phone out of its case and try the auto-rotate function. Some cases have magnets to keep them in place. These magnets can interfere with an Android phone's ability to auto-rotate. Purchase a replacement case without magnets, or remove the magnets and use Velcro dots instead to keep your case in place.

Factory Reboot

If you have tried all other options and the auto-rotate problem persists, you may need to take your phone to your wireless provider for a factory reboot, which will restore the phone's original settings and likely fix the auto-rotate problem. First back up all of your data, phone numbers and pictures either online or on your computer and synchronize your accounts--do not be afraid to ask a technician at the store for help--because all data is lost during a factory reboot.