OFFKEY TV was a company founded by Charlie Koolhaas and Artist Ollie Sylvester in 2004 to make art content for the newly invented camera phone.

Phonebrainz was a visual language made of animated gifs, developed as part of a thesis for Charlies MA in Interactive Media at Goldsmiths University, London.

Phonebrainz was exhibited in the Group Interactive media exhibition WITH OR WITHOUT in 2005, and was sponsored by Orange phone networks.