A tattoo that vibrates when you receive calls

Nokia plans to develop a tattoo that will vibrate when you receive calls. It has already obtained patents for the future technology.  They plan to let people have two options, either attach a small material to your skin or get a real looking tattoo with some smart technology working in the background.
For people who're wonder how this technology will work, here's a breakdown. The tattoo will be done using special ferromagnetic inks which will be sensitive to external magnetic field and will vibrate according to magnetic signals sent from the phone. Apart from the special ink, the tattoo will have looks and feel just like ordinary tattoos.
These cellphone generated signals and the resulting vibrations would be different depending or whether you are getting a call, or a text or something else.
This is one of those crazy futuristic piece of technology that I'd would not love to go for. The technology will be of great use in different cases like deaf people will find it extremely useful, people working at construction sites and many other crazy tech fans.