I have a new implanted cardiac defibrillator. Instructions are to use a cell phone on the ear opposite the ICD.
That aside, there was a story not long ago that some morbidly obese woman had grown to the couch where she lay, so that the couch material had become part of her skin.
From looking around Atlanta, It is evident to me that cell phones will be the next big evolutionary move. Cell phones are in use so much that they will grow to the ear and become part of human DNA.