Huawei B503B2 User Manual page 19

Do not touch the antenna when a call is going on. Touching the
antenna may affect call quality and cause the phone to operate
with more power. As a result, the talk time and standby time are
shortened.
The phone may interfere with nearby TV sets, radios and PCs.
In accordance with international standards for radio frequency and
radiation, use phone accessories approved by the manufacturer
only.
While using the mobile phone, observe the local laws and
regulations, and respect others' privacy and legal rights.
Clearing and Maintenance
Before you clean or maintain the phone, power off the phone and
disconnect it from the charger. Otherwise, electric shock or
short-circuit of the battery or charger may occur.
Do not use any chemical detergent, powder, or other chemical
agent (such as alcohol and benzene) to clean the phone and the
charge. Otherwise, part damage or a fire can be caused. You can
clean the phone and the charger with a piece of soft antistatic
cloth that is a little wet.
Do not scratch the shell of the phone. Otherwise, the shed coating
may cause skin allergy. Once it happens, stop using the phone at
once and go to see a doctor.
Keep the plug dry when you clean it, to prevent fire.
If the phone or any of its fittings does not work, turn to the local
authorize service center for help.
Do not dismantle the mobile phone or accessories. Only an
authorized service center is allowed to maintain the mobile phone.
Environment Protection
Please observe the local regulations regarding the disposal of your
packaging materials, exhausted battery and old phone and please
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