Activation Screen permanent bypass?? Various phones

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http://forums.androidcentral.com – I am working on a project for a school system where they want to used deactivated donated phones in the classroom for WiFi access only. They will be reset to Factory Defaults, so we'll need to get pass the Activation screen. It will be a variety of phones so that is why I am posting this here. It appears there are several different ways of bypassing the screen. I seriously doubt that they will allow Rooting of the phone, but I will pass it along as a suggestion. Seems like the most common is the 4 corner clockwise tap. This seems to work for HTC and Motorola. What I cannot find is if t (HowTos)