Was it the cell phone, or was it being in the park?
Lightning seeks the shortest distance between earth and sky. So one should avoid being the "tallest" object in an area during a thunderstorm. Being in a park can make one stand out, unless there are lots of trees nearby.
Of course, the cell phone use may have contributed to this, but I think it would be minor.
(Being insulated from the earth should also provide some protection, such has standing with shoes with rubber soles or other non-conductor. That's why vehicles are rarely -- never? -- struck by lightning.)
Gerry
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