Aquos R compact - Cannot Use SD Card; Cannot Send;Receive Mail

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Cannot Use SD Card
While Using Certain Applications
The application may be the cause.
Update the application if not the latest version.
If problem persists, delete the application, and check if same
problem occurs again.
See "Updating Installed Applications" for details on updating
applications.
See "Uninstalling Applications" for details on deleting
applications.
After Installing a New Application
The new application may be the cause.
Delete the application in Safe mode.
See "セーフモードで電源を入れる (http://help.mb.softbank.jp/
aquos-r-compact/02-05-04.html)" (Japanese) for details on
activating Safe mode.
See "Uninstalling Applications" for details on deleting
applications.
Cannot Send/Receive Mail
Airplane Mode Set
Is handset in Airplane mode? appears in Status Bar when
in Airplane mode. To cancel Airplane mode:
Drag Status Bar down
No "4G" Indication on Signal Level
Indicator
Is Mobile data disabled? To check that Mobile data is
enabled:
In Home Screen, Flick Favorites Tray up (Settings)
Network & Internet Data usage Mobile data
( )
Cannot Send with Attachment
The maximum size of files that can be attached to S! Mail is 2
MB.
To send large files, use Gmail, etc.
Cannot Receive Mail from Certain
Sender
Spam filter settings may be blocking delivery.
Check spam filter settings.
Disabled Access Point Is Set
Is a disabled access point set? To reset to initial settings:
In Home Screen, Flick Favorites Tray up (Settings)
Network & Internet Mobile network Access Point
Names Reset to default
Other
Check whether you are where signal is weak or out of service
area.
If problem persists, power handset off and then on again.