I scan and bag while I shop, so self-checkout is just paying. It's barely a shift of work from cashier to me, because I have to pick things up and place them in my bag/basket/trolley anyway, scanning them as I do is barely an increase in work.
Aka 'my phone', but yes. It's the same self-checkout machine (just only need to pay if you already scanned). Widespread in the UK at least.