MAC Address is a unique identifier which represents your device. To find MAC address on iPhone 6, iPhone 5 or other iPads, iPhones and iPods do as follows:
1. Open the Settings from the home screen
2. Go to the General settings
3. Hit the About on the top
4. Now, scroll down to the Wi-Fi Address which is the MAC Address of your iPhone
Note that, some wireless networks use MAC address protection, in which only devices with the allowed MAC address can joint that network.