I went to an orienteering event on Saturday. Orienteering is a race through a set of waypoints on a map; what sets it apart from a regular running race is the need to navigate via the map. Obviously it would be easy to cheat with a smartphone. Currently it's not hard to ensure people don't carry or use smartphones during the race. However, it's going to get increasingly difficult to detect cheating as technology progresses into smartphone watches, Google Glasses, and ultimately body implants. It doesn't seem practical to use X-rays or MRI scans on every participant, even if that would work.
Similar cheating problems are already happening in chess, and in written exams. Casinos grapple with these issues too.
It seems likely that any competitive event where real-time computer assistance (including communication with other humans) would be useful will sooner or later become practically impossible to secure against cheating. This will have profound effects. Even when people choose not to cheat, not knowing whether the game is fair is corrosive. Enjoy competitive games while you can.
This is going to be a problem for job interviews too.