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When calling, why it warns that the device is power off?

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When calling, why it warns that the device is power off?

GET STARTED
2022-06-01
  • Your SIM card should be valid.
  • Please check whether the SIM card is incorrectly inserted.
  • Observe indicator light. If network indicator is dark, this problem may be caused by SIM card, you can change another one and have a test. If this still can’t work, please return the device to factory to get an overhaul. 
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