Samsung GALAXY S8 User Manual page 255

Cannot use phone, mail, or Internet.
Solution 1: Check whether you are where signal is weak
or out of service area.
Solution 2: Power the phone on again.
Solution 3: Is the phone in Airplane mode? To check
that Airplane mode is canceled:
1. From home, swipe up to access Apps.
2. Tap Settings >
Airplane mode.
Solution 4: Is data communication disabled? To check
that data communication is enabled:
1. From home, swipe up to access Apps.
2. Tap Settings >
Mobile data.
Getting Help
Connections >
Connections > Data usage >
Solution 5: Is a disabled access point set? To reset to
initial settings:
1. From home, swipe up to access Apps.
2. Tap Settings >
Mobile networks > Access Point Names >
More options > Reset to default.
Battery level goes down quickly.
Solution: Are 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 applications.
Solution: Applications cannot be installed with only a
little free space on the phone or SD card. To check free
space, see "Storage" on page 211. Applications not
supported by your phone cannot be installed.
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Connections >