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When you use apps on your phone, various data is stored temporarily in the phone memory. If your phone runs out of memory, it may help deleting this data.
1. Find "Application manager"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Application manager.
2. Delete temporary data
Slide your finger left on the screen to find ALL.
Press the required app.
Press CLEAR CACHE.
3. Return to the home screen
Press the Home key to return to the home screen.