To disable the private or random MAC address and revert to your original MAC address on your iPhone®, iPad® and Apple Watch®, follow the instructions below.
Directions
Step 1:
Go to the Settings app on your iOS device.
Step 2:
Tap on Wi-Fi.
Step 3:
Tap the information button
next to the Wi-Fi name of the Linksys router or node that your device is connected to. For the Apple Watch, just tap on the Linksys network you are connected to.
Step 3:
Tap the information button

Step 4:
Tap the toggle switch next to Private Address to disable it.
NOTE: If your device is connected to the Wi-Fi without using a private address, a privacy message will pop up. Tap Rejoin.
NOTE: If your device is connected to the Wi-Fi without using a private address, a privacy message will pop up. Tap Rejoin.
Step 5:
Turn OFF your device's Wi-Fi and then ON again.
You have now successfully disabled the MAC randomization feature on your iOS device.