To delete a YouTube channel from your phone, access the app, touch the picture of your profile, and press Manage your Google Account. Find the Data & privacy option followed by Delete a Google service. In YouTube, find and tap the trash icon, then pick I want to delete my content permanently. Go over the confirmation checkboxes, type in your password if you’re asked, and tap the option to delete your content. It will get rid of all your YouTube data, but your Google Account will not be affected.