I accidently uninstalled the Gallery app that came with my Samsung Galaxy S3. I installed another gallery, but I cannot choose a photo for lock-screen.
Is it possible to reinstall the Gallery app? If it is, how do I do it?
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Personally I would use the Google Photos app, but yes, you can re-download it.
Here is a list of downloads for the S3 stock apps for Jellybean:
Download the gallery apk file on your phone, and open it. A promt will open, click install. Once it's finished, you can delete the file you downloaded, and open the app like you normally would.