I have run across this on my own iPhone and thought it would be a handy tip for other iPhone users.
How do you sort the photos on your iPhone? There is no button on the iPhone that lets you sort photos. The photo app on the iPhone takes it’s sorting cues from iPhoto on your Mac. However your photos are sorted in iPhoto is how they will be sorted when synced to your iPhone.
On your Mac select View – Sort Events and order your photos the way you want them to appear on your iPhone. If you have iPhoto and iTunes running you may need to quit and re-launch iPhoto on your Mac for the changes to take place.
Then, just sync your iPhone.
Congratulations, you just reordered the photos on your iPhone.
For more great tips check out our iPhone Tips and Tricks