IDEO's Social Mobiles project sought to design mobile phones that modify their users' behaviour to make it less disruptive.

Five working prototypes were developed by IDEO and designer/artist Crispin Jones.

The Musical Mobile constrains inappropriate use by forcing the user “to play the tune of the phone number they wish to call”[1]. The effort required to 'perform' the dialling of the number in public encourages the user to consider the appropriateness of the call.