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I don’t know of any Undo command on mobile devices – like Ctrl-Z. Sometimes tapping the BACK button does the trick. Sometimes and UNDO command pops up on the screen. Undo looks like a left curving arrow, Redo is a right curving arrow.
I haven’t used it, but on an iPhone you’re supposed to be able to summon that UNDO command to pop up by SHAKING the phone.
On an Android, you can install an app called Inputting+