How to select all photos and videos at one click from my i Phone?

Hello rajasekaran964,

1. Open Photos
2. Tap on Recents
3. Tap on Select in the top right

Once you tap on Select, you can select photos. You can either tap each on individually OR tap and swipe up (don't lift your finger or it'll stop).

Within other Albums, after you tap on Select, a Select All button should appear in the top left

this is not helpful at all, when you have tens of thousands photos you should be able to select all pictures at once with an one click.