The Independent Mobile Classification Body (IMCB) is a self-regulatory appeal mechanism for adult content classification ratings by mobile telephone operators and contracted content providers in the U.K. Its main responsibility is to set a Classification Framework for commercial mobile picture-based content which is now available on many mobile devices. It is the responsibility of content providers to use that Classification Framework and self-classify their own content as "18" where appropriate. Where the content is classified as "18" under the Classification Framework its access will be restricted by the mobile operators until customers have verified their age as 18 or over with their operator.