SED GPH-610R User Manual
Ensure that the SIM card has been inserted.
Check that your current position is covered by the service network.
Move the location to change the reception status.
I cannot power on the
handheld.
Ensure that the battery has been installed.
Ensure that the battery is supplying power.
Hold the power key.
The standby time has
shortened.
Ensure that the battery is fully charged.
Check whether the signal strength in your current location is weak.
Lower the LCD backlight.
Move to a place with stronger signals.