Mobile devices. Whilst we don't anticipate any interference with cellular phones, the total consequences of interaction with cellular phones are unknown right now. Moveable RF communications products (for example cell phones) needs to be kept a bare minimum distance of 6 inches (fifteen centimeters) from the area with the implanted unit. https://www.theorthopaedicandpainpractice.com/understanding-neck-pain-and-effective-treatments/