User's Manual

Page 47
the battery and some plastic parts.
4. Please do not try to open up or disassemble the device, unprofessional operation may leads to device damage.
5. Don’t use strong acid or alkali cleaners to clean the device
6. Use only approved accessories and batteries. Violate these rules will result in ineffective warranty.
10. Tips and Troubleshooting
Fault
Probable cause
Cannot be powered on
The battery energy is exhausted;
The battery is not in position.
(U)SIM card error
The metal face of the (U) SIM card is polluted. Clean the (U)SIM card with a clean
cloth;
Reinstall the (U)SIM card;
(U)SIM card is damaged, please replace it.
Poor quality of calling
Check signal strength on display screen, 4-grid signal means strong signal; less
than 2-grid signal means weak signal.
Signals are obstructed. For instance, radio waves cannot be effectively transmitted