User manual

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Solution 2: Power the phone on again.
Solution 3: Is the phone in airplane mode? To check that
airplane mode is canceled, open the Settings app, touch
Network & Internet, and check the Airplane mode switch.
Solution 4: Is data communication disabled? To check
that data communication is enabled, open the Settings app,
touch Network & Internet > Mobile network, and check
the Mobile data switch.
Solution 5: Is a disabled data access point set? You can
open the Settings app, touch Network & Internet >
Mobile network > Advanced > Access Point Names >
> Reset to default to restore the initial APN settings.
Problem: 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.
Problem: Cannot install applications.
Solution: Applications cannot be installed with only a little
free space on the phone or portable storage. To check free
space, see Storage. Applications not supported by your
phone cannot be installed either.
Problem: Cannot unlock screen.
Solution: Power the phone on again. If you are unable to
turn the phone off, press and hold the Power key for about
10 seconds to restart the phone. Data that was being
edited is erased after the phone is powered on again.