How to migrate old camera roll into new camera roll

Hi,

During a business trip, my old ip5 crashed and I had to buy the new ip6.

I've now used the new ip6 for 2-3 weeks and have taken quite a lot of new photos already. Therefore do not want to restore from old backup as i want to keep all new photos in the new camera roll.

...and here is the question: how to I migrate the old ip5 camera roll photos into the new ip6 camera roll, so they actually appear in the camaera roll? I do not want to have them in a separate folder, and therfore the typical suggestion of synching old photos to my PC and then synch them back to the new ip6, has no interest for me.

thanks in advance.