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9. Appendix
Ⅰ
Troubleshooting
Phenomena
Possible Causes
Unable to
switch on
1.
Does the battery have
power?
2.
Is the battery placed
correctly
SIM failed
1.
The SIM card is dirty.
Clean it.
2.
Reinstall the SIM
card.
3.
The SIM card is
damaged. Replace it.