Samsung Galaxy S21 FE 5G AT&T SM-G990UZWAATT Manual

To take a screenshot, press and hold the Power and Volume Down buttons simultaneously until the screen flashes. You can view the screenshot in the Gallery app.
To improve battery life, reduce screen brightness, turn off 5G when not needed, and use Battery Saver mode. Check for apps consuming excessive power in Settings > Battery and Device Care.
Go to Settings > General management > Reset > Factory data reset. Make sure to back up your data before proceeding, as this will erase all data on the device.
Go to Settings > Biometrics and security > Fingerprints. Follow the on-screen instructions to register your fingerprint. Make sure your finger and the sensor are clean.
Ensure Wi-Fi is enabled on your phone. Restart your router and phone. Check for software updates in Settings > Software update. Forget the network and reconnect by entering the password again.
To update the software, go to Settings > Software update > Download and install. Follow the prompts to download and install any available updates. Ensure your device is charged or plugged in during the update process.
Use the Device Care feature in Settings to clean up unnecessary files. You can also uninstall unused apps, move photos and videos to cloud storage or external storage, and clear app caches in Settings > Apps.
Ensure your SIM card and plan support 5G. Go to Settings > Connections > Mobile networks > Network mode, and select an option that includes 5G.
Remove any cases and let your phone cool down. Avoid using intensive apps for long periods. Ensure proper ventilation and avoid direct sunlight. Check for software updates that might address overheating issues.
Use the Samsung Smart Switch app to transfer data from your old device. You can connect both devices via USB cable or use Wi-Fi for the transfer. Follow the on-screen instructions in the app.