1, press # 66666, and then press the administrator or management password to enter the system menu.
2. Press # to select the first item in the menu, and the user will be managed to the administrator group, then press # 8 to # 4 to delete the mobile phone, and then press # and then select the mobile phone of the 1 No.3 administrator you want to delete. After selecting the tag, press # to see the phone number to delete the binding. You can press # to confirm the deletion of the binding correctly, or press # to go back and re-select the user number to delete the binding. When deleting the mobile phone binding of ordinary users, select the corresponding user group 1 or user group 2 instead of the administrator group.