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4. System Firmware Update
Android devices automatically receive over-the-air (OTA) updates. To manually check for a firmware
update, select Settings > About tablet > Wireless Update.
4.1 SIM Management
4.1.1 Voice call
Click settings in main menu, choose SIM Management, as Picture 4.1
Picture 4.1
Click voice call, choose defaulted SIM card, as Picture 4.2
Picture 4.2
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