If you want to watch a YouTube video on your iPhone without using an app, there are a few ways to do it. The first way is to open the YouTube app and search for the video you want to watch. Once you find the video, tap on it to open it. Then, tap on the three lines in the top left corner of the screen (known as the share button), and select “Copy link”. Next, open up Safari on your iPhone and paste the copied link into the address bar. Tap on Go. YouTube will start playing automatically. The second way is to use Safari’s built-in download feature. First, open up Safari and go to www.youtube.com/watch?v=Youtube_ID . Next, tap on the video that you want to download. You will now be taken to a page where you can choose whether or not you want to save the video onto your device (if it’s already been downloaded). If not, tap on “Download” and choose where you want to save it onto your device (usually this is in Videos). Finally, open up iTunes and click on Videos in the left-hand column (or press Command+V if you’re using a Mac). You will now see all of your downloaded videos listed here (assuming that they have been saved onto your device). Simply select which one you want to play by double-clicking on it or by pressing Command+A (Mac) or Control+A (Windows) if it’s highlighted in blue. ..