The technology, dubbed the iPalm, means you can do things on your phone even if it is tucked away in your pocket.
It relies on users knowing the layout of their smartphone and mimicking the actions they normally use on it.
These movements are filmed by a motion-sensing camera worn by the user which then transmits information wirelessly via a computer to the actual phone.
Researchers hope the cameras could be small enough in future to be integrated into clothes or jewellery so people would not even notice if someone was carrying an ‘imaginary phone’.At present, users still need the actual phone for calls but they could use iPalm to access apps, turn on speakerphone and remotely take calls.
The inventors believe the technology could be extended to TV remotes, potentially making them extinct.
Inventor Patrick Baudisch, from Germany’s Potsdam University, told the New Scientist: ‘We envision users will initially use imaginary phones as a shortcut to operate the physical phones in their pockets.
‘As users get more experienced, it might even become possible to leave the device at home and spend the day all imaginary.’
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