How to get photos/videos from backup/iCloud?

Okay, so a few months ago I "inherited" my mom's iPhone 4. There were a bunch of photos and videos. I really wanted to keep some of them but while transferring info from my old iPod to the iPhone, they all disappeared.
Either they disappeared on their own or I deleted them.
Even so, is there any way to get the videos/photos back? If I deleted them, is it still possible (even though I'm pretty sure I didn't delete them)? And is it possible to "log in" to my mom's Apple account on my phone and get all of the photos/videos back?

If you have synced with iTunes on your computer, there should be an iPhone backup files. You can "restore from iTunes Backup". Or you log in your mom's iCloud account, and restore from iCloud.
If you have no iTunes backup and iCloud backup, your unique choice is to recover with a data recovery tool.
http://www.datarecoveryforiphone.com/ios-data-recovery.html

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