Zte R621J User Manual page 9

Therefore, power off your phone if required.
 Do not touch the antenna while calling. Otherwise it will affect the
quality of calling and waste battery energy. The damaged antenna
will cause slight burn while touching your skin.
 Keep phone out of the reach of small children. Phone may cause
injury if used as a toy.
 Do not put other things on the terminal to avoid overlaying radiator.
 Keep the antenna free from obstructions and position the antenna
straight up. This will ensure best call quality.
Precautions for Potentially Explosive Atmospheres
 Switch off your phone prior to entering any area with potentially explosive
atmospheres, such as fueling areas, fuel or chemical transfer or
storage facilities.
 Do not remove, install, or charge batteries in such areas. Spark in a
potentially explosive atmosphere can cause an explosion or fire
resulting in bodily injury or even death.
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