For More Help; Safety Information - Huawei F688 Quick Start Manual

In standby mode, press
Select Settings > Handset > Security > Keypad lock to set the keypad lock. If
automatic keypad lock function is enabled, the keypad will be automatically locked
when the standby time exceeds the preset period in standby mode.
PIN and PUK
Personal identification number (PIN) code helps effectively prevent unauthorized use
of your SIM card. Personal unblocking key (PUK) code helps change the locked PIN
code. If you enter the wrong PIN code for three times, your SIM card will be locked.
In this case, you need to enter the PUK code to unblock the locked PIN code. Please
note that if you enter the wrong PUK code for ten times, your SIM card will be
permanently locked, you need to consult your service provider to replace your SIM
card. PIN code and PUK code are provided together with the SIM card. For details,
consult your service provider.
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For more help

Please visit http://consumer.huawei.com/en/support/hotline for recently updated
hotline and email address in your country or region.
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Safety information

This section contains important information about the operation of your device. It
also contains information about how to use the device safely. Read this information
carefully before using your device.
Electronic device
Do not use your device if using the device is prohibited. Do not use the device if doing
so causes danger or interference with other electronic devices.
Interference with medical equipment
Follow rules and regulations set forth by hospitals and health care facilities. Do not

use your device where prohibited.
Some wireless devices may affect the performance of hearing aids or pacemakers.

Consult your service provider for more information.
Pacemaker manufacturers recommend that a minimum distance of 15 cm be

maintained between a device and a pacemaker to prevent potential interference
with the pacemaker. If using a pacemaker, hold the device on the side opposite the
and then * key to unlock the keypad.
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