How to recover photos from a stolen iPhone?
If you didn't get the iPhone back and they stole it with no internet, then you cannot recover it. 

If you had iCloud setup on your iPhone, then when the robber decides to connect it, the photos should get synced with the cloud, and require an activation lock so he shouldn't be able to use it. 

If you manage to find phone with find my iPhone, contact the police and tell them where it is.