How to save my OWN YouTube videos onto my iPhone camera roll?

Is there a way to save my OWN YouTube videos onto my iPhone camera roll? If not then, is there a way to somehow save the video onto my phone without downloading a bunch of apps that don't work? I'M DESPERATE Please Help

YouTube downloader <---- Google it

You can't do that directly on your phone.
You have to download the video on your computer, use iTunes to transfer the video, and you can see it on your Videos app.

The only possible way to do exactly what you want is by jailbreaking your phone, downloading a tweak that allows you to download files through Safari, using a website like keepvid.com and downloading the video, and then using an app like iFile to transfer the video to your Photos app.

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