Welcome to Headwind MDM Q&A, where you can ask questions and receive answers from other members of the community.
IMPORTANT: Please notify the team about your question by filling in the form on the contact page. Otherwise, we may miss your question!
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.