[Tom Wesenberg]

I bought an insulated lighter socket on ebay for a couple dollars, and I simply wired the center terminal to the ground, and the case to any power source close by. The socket can lay loose on the floor or be mounted with tape or a hose clamp to the steering post. I use it for my GPS, and it works fine with no extra electronic devices needed.

I don't own a cell phone, but others report it also works fine for them.