I'm currently sitting in the quiet carriage of a Virgin train. There is a sign that says "Please do not use mobile phones or create unnecessary noise."
A woman has told off another for making a loud phone call. Told off woman has asked other woman why my son's not being told off. He's playing games on a mobile phone with sound off and no vibration.
Technically he's using a phone but AIBU to think that the sign means not to make phone calls and playing games on a phone without sound/vibration is ok?