stick on goiter
(various colors, shapes, skin tone to match for a natural look or not, varied texture you could get a meaty supple Techno Goiter or a tough thick one)
essentially a computer built into a rubbery enclosure that looks like an excessive goiter, you visit your plastic surgeon to choose
and be fitted for a high end model that makes you look best in the mirror. it sticks to your neck and the underside of your jaw where a real goiter goes
loaded with wireless access, broadband internet, modem etc.. and has skin flaps with embedded speakers that extend just below your ears so that you can hear and have a conversation without ear buds.
would think it could be voice activated or have some way of activating your teeth as keyboard keys
or maybe it could monitor tongue action as an input device
vibration from speaking, eating, swallowing or swinging from side to side as you walk(depending on how extended a model it is) would keep the batteries charged.
last thing the best part would be if the goiter could speak to you and announce your schedule or broadcast your phone conversation, or play music