Usage patterns
スマホを見るto look at one's smartphone
I was looking at my smartphone the whole time on the train.
スマホをいじるto fiddle with / play around on one's smartphone
I was fiddling with my smartphone during class and got told off by the teacher.
スマホで〈動詞〉to do something using a smartphone
I took a photo with my smartphone.
スマホを充電するto charge one's smartphone
I charge my smartphone before going to bed.
スマホが鳴るfor one's smartphone to ring/buzz
My smartphone rang during the meeting.