Sure, but wasn't cockroach charging introduced in 2015, vs. c. 2010 for 4-inch Android phones?

What's 'cockroach charging'?

Upside-down, like a dead cockroach: https://www.behance.net/gallery/36272401/Dear-Apple-about-yo...

Ah, I see. I've never seen a phone which charges from the underside, though.

There's a pretty common use case that's basically this: get in the car, plug in the phone, and drop it in a cup holder with the charging port pointing up and all the antennas that would point skyward during handheld use are now pointing at the ground.