Please note that the SIM card must be inserted when the device is powered off. After installing the SIM card, you need to restart the Dasaita head unit by following these steps:
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Go to Settings > Car Settings > Factory Settings.
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Enter the password: hctreboot.
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The unit will restart, and T-Mobile or other carrier service should begin working immediately.
To Make Calls:
Go to Settings > Factory Setting, enter code 126, then select Other and turn on SIM Card Voice Call.
