Over the years less and less people have been availing of the option to upload images via MMS and the few people that do select it, can have a poor experience. This is due to poor support from the various networks for this service.
DoneDeal aims to provide the most simple, easy to use place ad process and the MMS upload is impacting this negatively. With this in mind we've decided to drop support for MMS upload.
You can read more about uploading photos via your computer here