Verykool i235 - Manual (Page 11)

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2.2 Use of the environment
When you take a plane the phone should be turned off, wireless
devices may cause interference in aircraft.
In the hospital should be powered off, the phone may make some
medical equipment (such as pacemakers, hearing aids, etc.)
have an impact.
At gas stations, oil depots, chemical plants, where blasting
operations or near flammable materials and chemicals areas,
do not use the phone.
Do not use mobile phones while driving, before using, you
should stop your car.
2.3 Fair Use
Just use your phone in the normal position.
When you connect it to other devices, please read the
instructions for detailed and safety actions, do not
connect incompatible products.
Only qualified personnel can install and repair the phone.
2.4 Accessories and batteries
Use only the specified batteries and accessories.
The use of any unauthorized accessories may affect the phone's
performance, even lead to physical danger or in violation of
state on the relevant provisions of communication terminal
products.