So there's this guy named Frank Swain whose a writer for New Scientist magazine that recently started using hearing aids. He wondered about using hearing aids for things we can't normally hear as humans, even with perfect hearing. So with the help of a sound artist, he hacked his hearing aids to let him hear nearby wi-fi signals as sound. The signal itself is represented by a clicking noise, with the frequency equal to the proximity. And it's directional - you'll hear it in your right ear if its on your right, for example. And then the network ID is heard as notes, with each letter or number corresponding to a certain note. Here's an example of what it sounds like.
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