(기초영작문) 'call+사람, call on+사람, call to+사람' 의 차이

call + 사람 : ~에게 전화하다
He called me last night from London.

call on + 사람 : ~를 방문하다
He called on her yesterday, but she was not at home.

call to + 사람 : ~를 (외쳐) 부르다 
I called to Dad but he didn't hear me.