Samsung Galaxy S8 troubleshooting

Problem:Solution:
Phone freezes/operation is unstableTurn the phone on again. If you are unable to turn the phone off, remove and replace the Battery, and then turn the phone on again. Data that was being edited is erased after your phone is powered on again
Operation is unstable after a new application was installedThe newly installed application may be the cause. Uninstall the application in Safe mode. See Uninstall Apps for more information about uninstalling apps.
To turn the phone on in Safe mode: Press and hold the Power key, touch and hold Power off, read the disclaimer for safe mode, and then tap Safe mode. After turning the phone on in Safe mode, “Safe Mode” appears at lower left. After restarting in Safe mode, your phone can be powered on as usual. Before turning the phone on in Safe mode, it is recommended that you back up important data. By powering the phone on in Safe mode, added widgets may be deleted
Cannot use phone, mail, or InternetCheck whether you are where signal is weak or out of service area
Power the phone on again
Is the phone in Airplane mode? To check that Airplane mode is canceled:
1. From home, swipe up to access Apps.
2. Tap Settings > Connections > Airplane mode
Is data communication disabled? To check that data communication is enabled:
1. From home, swipe up to access Apps.
2. Tap Settings > Connections > Data usage > Mobile data
Is a disabled access point set? To reset to initial settings:
1. From home, swipe up to access Apps.
2. Tap Settings > Connections > Mobile networks > Access Point Names > More options > Reset to default
Battery level goes down quicklyAre you where signal is weak or have been out of service area for a long period? Calling where signal is weak or being out of service area uses a lot of Battery
Cannot install applicationsApplications cannot be installed with only a little free space on the phone or SD card. To check free space, see Storage. Applications not supported by your phone cannot be installed
Cannot unlock screenPower the phone on again. If you are unable to turn the phone off, remove and replace the Battery, and then power the phone on again. Data that was being edited is erased after the phone is powered on again