The reason cellphones are relevant here is that they are used to record the event, either through still images or videos. So, to compare, we need to look at the people in these photographs and try to figure out how likely it is that there is a camera nearby to record the event.
The reason cellphones are relevant here is that they are used to record the event, either through still images or videos. So, to compare, we need to look at the people in these photographs and try to figure out how likely it is that there is a camera nearby to record the event.