How can I remove photos from iPhone without using the computer it was originally synced with?

The computer I synced my iPhone with has broken and no longer have access to. I have over 3,000 photos/videos which are "synced" albums and I do not have the option to delete these. They are taking up a lot of memory and I want to remove them. Anyone have a solution?

Would likely have to use another computer with iTunes to do that.