If you use your device for business, your organization might require Wi-Fi mac address of your device for wireless connection. Privacy setting of Wi-Fi use randomized MAC by default, you need to change it to “Use device MAC” manually, follow steps below to change:
1) Touch “Settings”
2) Touch “Wi-Fi”
3) Touch and hold the Wi-Fi name with connected status in the list
4) Touch “Modify” in the dialog that opens
5) Touch “Advanced options”
6) Touch “Use randomized MAC” under privacy, then touch “Use device MAC” in the pop-up menu.