Restore photos from an erased iPhone? [duplicate]

This question already has an answer here:

• iPhone 4 - is it possible to do a photo recovery for photos without a previous backup 2 answers

I own an iPhone 5 which I erased by going to Settings->General->Reset->Erase all content(like described here) before a sale and I now realized that I didn't backup most of the photos (not to Dropbox and not to iCloud). The phone was never connected to a computer so it doesn't have any backup trough icloud and I haven't used photostream.

I haven't sold it yet, is there an option to recover the photos?