Uninstalling a missing plugin?

[bigwest]

Sometime back I installed something that would automatically detect if a user was browser into my site on a cell phone and switch them to a lite template style I had installed on my forum.

Now, I want to get rid of that feature.

Yet when I go to my installed plugin's I see no such plugin. I guess it's possible it was some type of hack instead of a plugin but for the life of me I can't remember how I did this.

I was hoping maybe somebody out there might have an idea of what I did and then be able to help figure out how to get rid of this feature.

Thank you in advance for your time!!