At first, you have to make sure whether you have ever backed up the photos you took on iTunes or iCloud. If yes, then you should be able to restore them after they were deleted or lost instantly by using "restore from backup" function on your phone. On the other hand if you are like most other iPhone users who do not regularly backup their data, then don't worry you can recover most types of deleted or lost files from iPhone as well.
How can You Recover Deleted Photos from iPhone?
Most of you may not know that your iPhone does automatically backup all your data every time you sync data between your iPhone and iTunes and stores it as a .sqlitedb file. So you can recover data without even having access to your iPhone, this is good for users who've lost or broken their phone. However this file cannot be accessed or viewed unless you have some special algorithms to extract it, again this is where 3rd party software, which are specifically designed to help with your iphone data recovery needs come to your rescue.
To get your personal data back, I would like to recommend you use a professional 3rd party iPhone data recovery software. The software recommended is Tenorshare iPhone Data recovery, it offers a free trial version for download which allows you to check out and recoverdata from iPhone in minutes. It is able to retrieve your deleted or lost files including photos, contacts, music and videos, call history, text messages and SMS attachments, notes, calendars, recordings, reminders, or even Safari bookmarks. It is compatable to recover data from iPhoen 5, 4s, 4 and 3gs. BTW, you can download it from here: http://www.any-data-recovery.com/product/iphone-data-recovery.html
Your other option to recover photos from iPhone would be to contact some data recovery professionals, but they may charge hundreds of dollars. You could try figure out how to get them back on your own without downloading any software if you are extra technical and geeky but for the majority of us the easiest and most convenient way to undelete files from the iPhone would be to download some software. You simply click a few buttons and boom your files are back.
So if you are just in trouble of photo loss on your iPhone, find a right tool to help you recover photos from iPhone quickly and easily. It is an absolute necessity to have such a iphone data recovery software on hand to prevent accident and disaster happens that may lead to photo loss.