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I think there may be a telephone with a scent emitter. The emitter contains a lot of scent of flowers, and on the screen of the telephone, we can find a list of scent.
You can set the telephone number to the list. For example, the number of your girlfriend ok! certainly the scent of rose or other scent of flower what she like; if your classmates maybe the scent of lily, and so on...
Then when you hear the calls, if you feel the scent of rose, ok it's her, no doubt! I think this idea will make our room more comfortable and make your talk more brighten!
Also it can be used in mobile telephone.