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New York governor to launch bill banning smartphones in schools
(www.theguardian.com)
This is a most excellent place for technology news and articles.
My kids have child phones on Google Fi which allows me to shut down their Internet with a couple of button presses. Are they simple devices if I geofence their internet access off while they're in school? I somehow doubt it, but it does meet the definition as you've stated it, which in turn means it is as @originalucifer said, not exactly cut and dry.