Step 1:
On the Home screen, tap
.
On the Home screen, tap

Step 2:
Tap General.
Tap General.

Step 3:
Select About.
Select About.

Step 4:
Scroll down and look for Wi-Fi Address. The Wi-Fi Address is your iPhone's MAC address.
Scroll down and look for Wi-Fi Address. The Wi-Fi Address is your iPhone's MAC address.

You should now have successfully checked the MAC address of your iPhone.