Meizu M351 - Manual (Page 58)

Troubleshooting
In case of problems, please refer to this guide. If the problems persist, contact
your dealer or visit our website. You can find frequently asked questions and a
community forum on our official English website at http://en.meizu.com.
Entering PIN
Enter your SIM card PIN code. If you do not know the code, contact your carrier
for information.
Entering PUK
After entering the PIN code incorrectly three times, your SIM card will be locked.
To unlock, you must enter the PUK code.
Unable to send messages
Please check that the network signal is normal.
No SIM card inserted
Confirm SIM card is properly inserted. Check that the SIM card is working properly
as it may be defective or faulty. If so, contact your carrier for a replacement.
Out of service or network failure
Check the signal strength. If there is no network signal, you may be in a network
blind spot. Move to another spot to regain signal.
Poor sound quality, echo or noise during conversation
Hang up and dial again.
Short battery life
Where the signal is weak, the phone will constantly be looking for signal, which
drains the battery. When you do not need the phone function, you can turn the
phone radio off. If the battery has been used for too long, battery life will
deteriorate, and battery should be replaced.
Phone does not boot
Check the battery status.
Other 58
Other