SENDO S251 User Manual page 37

Problem Possible cause
"Blocked" is displayed The NCK code has been
on my handset entered incorrectly 10 times and
the handset has been security
disabled
A key on the keypad is The keypad is not seated
not working correctly after removing and
replacing the telephone's
plastic cover
Poor display Low temperature
Can't connect to Weak signal
network
Invalid SIM card
Network not allowed
Can't make/receive Weak signal
calls
Phone is switched off
Check the number
Call key not pressed
Network is busy
Call barring or fixed dialing is
activated
Not registered with service
provider
No credit left on your prepaid
card
Low earpiece volume Low setting
Low ringer melody Low setting
Possible corrective action
Return the handset to your service operator or to an
authorized Sendo service center for resetting.
Remove the telephone's plastic cover and re-seat
the keypad correctly.
Move to a warmer place and let the phone warm up.
Move into an area of better coverage. If you are in a
building, move towards a window.
Contact your service provider.
Try reselecting the network. Switch off and then back
on.
Check that the service provider name is displayed on
the screen. If not, try to reconnect to the network.
Press d for a few seconds.
Use the full area code and country code in the
number.
After dialing the number you must press g,
If you hear rapid beeps, then the network is busy.
Hang up and try again.
Check the fixed dialing settings. Otherwise check the
call barring settings with your service provider.
After purchasing your phone, you may need to call
your service provider to activate the line.
Recharge your credit.
Press : when you are in a call to increase the
volume.
Sounds
Go into the
increase the setting.
39
Volume
menu, select and
13
Call
.