Emergency Calls; Environmental Protection - Huawei U3900 User Manual

Before you clean or maintain the device, stop using it, stop all

applications, and disconnect all cables connected to it.
Do not use any chemical detergent, powder, or other chemical

agents (such as alcohol and benzene) to clean the device or
accessories. These substances may cause damage to parts or
present a fire hazard. Use a clean, soft, and dry cloth to clean
the device and accessories.
Do not place magnetic stripe cards, such as credit cards and

phone cards, near the device for extended periods of time.
Otherwise the magnetic stripe cards may be damaged.
Do not dismantle or remanufacture the device and its

accessories. This voids the warranty and releases the
manufacturer from liability for damage. In case of damage,
contact an authorized service center for assistance or repair.
If the device screen is broken in a collision, immediately stop

using the device. Do not touch or attempt to remove the
broken parts. Promptly contact an authorized service center.

Emergency calls

The availability of emergency calls is subject to your cellular
network quality, service provider policy, and local laws and
regulations. Never rely solely on your device for critical
communications like medical emergencies.

Environmental protection

The device and its accessories (if included), such as the power

adapter, headset, and battery should not be disposed of with
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