I believe zombies can use touch screens, but I'm not sure about all touch screen technologies.
Wikipedia
For instance, a capacitive touchscreen panel relies on the human body being an electrical conductor; touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance. Does zombie flesh still act as an electrical conductor? I would hazard a guess yes, except that I am not certain what method would be used to animate your zombies ... and don't have one to experiment on!
Finding that Wikipedia article was also fascinating for me, as I learned the technical term "Gorilla Arm" and what it means! LOL! (BTW, this informs me that vertical touch screens might be an area where zombies would excel over humans, as their already-dead arms probably wouldn't suffer from "Gorilla Arm" fatigue.)
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As the poets have mournfully sung,
death takes the innocent young,
the rolling in money,
the screamingly funny,
and those who are very well hung.
Your days are numbered - 26,280 per person on average - 2,000,000,000 heartbeats ... tick, tick, tick
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