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I don't have any information of SIM inserted in the device. It shows the telecom operator name in dynamic information but no cellphone number.
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1 Answer

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Headwind MDM uses Android system functions to get the device info. For the cell phone number, it uses TelephonyManager.getLine1Number().

It is a fact that some SIM cards do not return the phone number, this is apparently some SIM card setting which could not be changed.

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