When I was young in my first apartment, I made a fan with an old motor I found. The motor had brushes that sparked badly.
Then the RF cops detected my fan and almost arrested me. They said that my fan was causing radio and TV interference to hundreds of people and took it away.
Your arcing circuit will also cause interference to radios, TVs, police and ambulance communications and maybe airplane communications.
Many receivers have a sensitivity that is much higher than the cell phone that you want to jam.