FLY Fab! F51 User Manual page 58

4. SIM card might not be inserted properly
4. You can't make a call?
Possible Reasons for Malfunction
1. Phone power off.
2. Phone is out of the network service area.
3. Your SIM card is not proper or out of service
fee.
4. Perhaps you set up call barring.
5. The phone screen is locked.
5. I cannot hear and/or be heard from the other side?
Possible Reasons for Malfunction
1. Call volume is low.
2. Mute icon is pressed during the call
3. The signal is poor or unstable
Please check, and insert the SIM card properly.
Solutions
Please power on your phone.
Please make sure the current network is in
good service.
Make sure your SIM card can work properly.
According to your needs, please cancel call
barring.
Please unlock the screen according to the
prompts.
Solutions
Please raise the phone call volume.
Please deactivate the Mute function.
Please move to an open area or an area with
good signal strength.
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