The Smart Boost feature allows the Boost+ app to automatically free up memory space on your phone.
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 From the Home screen, tap  , and then find and tap Boost+. , and then find and tap Boost+.
- Tap  , and then select or clear the Smart boost option. , and then select or clear the Smart boost option.
- When prompted to set up the system permission for Boost+, tap 
- Tap the  Permit usage access On/Off switch.