The phone could use another button or two - but the OK is the main one that I miss.. You do have the shutter button (hidden.. I didn't even realize it was there initially) which can act as a single or double press (or probably as 1, 2, 3, or long press using ae button plus..) Also holding down the end key gives you the option or lock, today screen, or flight mode.. (or it can pop up a menu asking which option to use..)
-mark
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