Visit Samsung's official website → Support → Warranty Check → Enter your device IMEI or serial number.
Go to Settings → Software Update → Download and Install.
Settings → General Management → Reset → Factory Data Reset. Backup your data before resetting.
Settings → Battery & Device Care → Optimize Now.
Download Samsung Pay → Add your card → Complete verification → Start payments.
Power Button + Volume Down OR Palm Swipe Gesture.
Visit OnePlus website → Support → Warranty → Enter IMEI.
Settings → System → System Update → Download & Install.
Settings → System → Reset Options → Erase All Data (Factory Reset).
Open Zen Mode app → Choose duration → Start focus mode.
Clone Phone app → Connect devices → Transfer data.
Xiaomi website → Support → Warranty → Enter IMEI.
Settings → About Phone → System Update → Download & Install.
Settings → About Phone → Factory Reset → Erase All Data.
Settings → Special Features → Game Turbo → Add games.
Settings → Mi Account → Mi Cloud → Enable backup.
Visit Oppo official website → Warranty Section → Enter IMEI.
Settings → Software Update → Download & Install.
Settings → Backup & Reset → Erase All Data.
Settings → Battery & Performance → Optimize Now.
Open Clone Phone → Connect → Select data → Transfer.
Settings → Display & Brightness → Dark Mode.
Volume Down + Power OR Three-Finger Swipe.