Firstly you need the SAVEFROM app installed on your device. You can get from Google playstore or type ss before the YouTube URL.
Open YouTube on your mobile browser and search for the video you want.
Pause the video when it's about to play.
Press and hold on the videos title and a option menu pops out.
Select share and find the SAVEFROM on the sharing apps displayed.
Select it and it's automatically takes you to the SAVEFROM interface.
Wait for it to load.
Select your quality (720p is the highest but uses lots of data).
Then click on download.
*Another way is to copy the YouTube video link.
Open the SAVEFROM app
Paste the link on the field provided and wait for it to load.
Choose your quality and click download.

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