Verykool i800 - Manual (Page 66)

66

You are out of network service coverage.

USIM card is invalid. Contact your network service provider.
When you have entered a number but it was not dialed

Make sure that you press the dial key.

Make sure that your account is still active. Make sure your USIM
card is valid.

Make sure that you have not set outgoing call barring.
When the quality of your call is poor

Check the volume.

You are in a weak signal area, such as near a tall building or in a
basement where radio cannot be efficiently transmitted.

You are using your phone during a busy period, such as during the
morning commuting time when the lines are too busy to go
through.
When calls from other phones cannot reach you

Make sure that your phone is switched on and connected to the
network.

Make sure that your account is still active.

Make sure that your USIM card is valid.

Make sure that you have not set incoming call barring.
When you speak but cannot be heard on other phones

Make sure that you have switched on the microphone.

Make sure that you are holding the phone close enough to your
mouth.
When the standby duration is too short

The standby duration is related to the network settings. You may
be in a weak signal area. If your phone cannot receive signals, the
phone will continue to send a signal to search for base station and