They use a dark bar that appears only when you touch the screen and start to move your finger up/down.
This is implicit and automatic scrolling behaviour - normally you do not need to do anything - it just happens.
Mobile devices users naturally expect they can scroll a screen in any direction.
There is no need to tell them they can scroll - it would just be wasting precious screen space - especially on phones.
The size of the bar and its location provide the classic sense of the amount to scroll and where you currently are:
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