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A VPN provider won't protect your MAC address from being physically tracked.

IIRC iOS 8 performs MAC address randomization for just this reason.

This is only when searching for WiFi... once you connect the access point will know your true MAC address.

No, unfortunately the MAC randomization seems to be pretty ineffective. IIRC, it only happens when the phone is sleeping, and has been for several minutes. http://9to5mac.com/2014/09/26/more-details-on-how-ios-8s-mac...

But a rooted device does.