Can you retrieve old deleted photos from an iPhone 4?

I had my phone for like 2 years now and I took some embarrassing photos with my friends when I was younger (they're hilarious but so embarrassing).
I don't want anyone to ever retrieve then or see them lol. I deleted them before I synced my phone aha.
Is it possible that my service provider my dig them up?

No. If you've deleted them they're gone forever unless you have iCloud and they're on someone else's device too.

No, if you deleted them off of your device there's no way for someone else to retrieve them, the only way that would be possible if they restored your phone using the back up that contained the pictures other than that there's no way possible for them to ever gain access to them.

Since you haven't synced your phone before deleted photos, the only way is retrieve iPhone 4s photos from iPhone directly. And how can we do? The answer is YES! Quickly visit any-data-recovery.com where many people have got theire pic back without backup.