No hardware reasons, and probably no software ones. :/ Wi-Fi MAC is unrelated of the IMEI of the phone. It's on a different chip, and uses different antennae.

No hardware reasons, and probably no software ones. :/ Wi-Fi MAC is unrelated of the IMEI of the phone. It's on a different chip, and uses different antennae. (Eg, you can browse over Wi-Fi while talking on your cell connection)