Well you have basically three options in my bubble.
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Handy
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Wischkästla (translates roughly to swipe box)
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Mobiltelefon (mobile phone) this one needs to be pronounced very precisely in order to get the sarkasm of using the old correct German word.
Apparently he was the only one in the river scene who knew what was about to happen. So all the screams of the other people were real.