As a circuit design goes through various incarnations, a lot of editing of component positions, interconnections and values is generally needed. As others have indicated above, this could be extremely frustrating with the small screen area available on a phone. In particular, you would be unable to 'read' a circuit by seeing components in context, or see both ends of an interconnect trace at once when trying to draw one.
Simulation would be possible though, and there are various Android apps available for that.