How to delete photos from iPhone 4S that have not been transferred by iTunes?

I got the pictures on my old phone transferred to my new phone by a guy who works at a shop. He did not use iTunes to transfer the pictures from my old phone to the new one, he used some other program instead. Now when I go to my Photos on my new phone, the transferred photos are in a folder on their own. I don't want the folder anymore and I don't have the option to delete it. I can't delete the pictures individually either. Is there a way to delete this folder without having to use iTunes? Is there an app or program or something that does that?

If you go onto itunes and click into the phone, go to pictures/photos tab and they should be there. You can then unselect them so they arent synced to your phone anymore.

You can use some third party software like this iTunes alternative, it can manage your iPhone files like delete, copy, etc. Hope it helps you.
http://www.reviewstown.com/itunes-alternative.html
Feel free to email me if you need further help.