I don’t use SecretPhotoVault, but I am writing this review so that the developers will see it. The reason you get so many reviews intended for “UnderLock” is because when you search “UnderLock” in SecretPhotoVault Store, SecretPhotoVault pops up first, and the icon is very similar to the UnderLock icon.
For the people who are here because they think it is UnderLock, I FOUND A WORKAROUND: put your phone in airplane mode, wait a minute and then open SecretPhotoVault . When the “upgrade to premium” screen blocks you this time, there will be an X on the upper left hand corner that will allow you to X out and get to your photos. At that point you can go to each photo and save them to your phone’s camera album. Then you can re-hide your photos in a better, more reputable app LOL
I had to move the photos ONE at a time out of UnderLock, because if you try to do more, you get blocked by the “premium” ad again. Hope this helps! And I gave SecretPhotoVault five stars to make up for all the people giving 1 star, thinking that it’s UnderLock LOL
Good luck!