TV Remotes
Nowadays, you can download a universal TV remote app right to your phone. You'll never have to fish for the remote in between the couch cushions ever again. And, the days of determining which remote works the TV and which works the DVD player are over.
GPS Devices
Plug-in devices for your car's dashboard tend to be laggy and unreliable. Most phones have built-in maps apps and since the creation of Waze, nobody has been buying third-party devices for their cars. Maps apps are even helpful in finding walking and public transit directions.