User's Manual

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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, 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.