A:AnswerThe extra cable is harmless, just wrap it up neatly and stow it away, no good way to shorten. For longer runs you can buy cables at many online retailers like Amazon and barrel connectors to join lengths together to cover larger distances.
A:AnswerYes, once you set up the unit and have it connected to your router you would be able to download the Lorex App and view the cameras on your phone.