Guess how many devices have converged into the modern smartphone? OK, I'll start: wireless telephone music player camera GPS PC: word processor spreadsheet emailer browser text messager video conferencer Gameboy e-book reader camcorder movie player flashlight calculator notepad TV remote e-commerce device To name a few...
radio, TV, pager, weapon (remote bomb detonator), vanity (replaces watch, jewelry, and fashion clothes), voice recorder, light and sound detector, and a whole lot of more (based on various apps).
There's an app for taking your pulse, you place a finger over the flashlight port, and it somehow detects pulse, shining the light through your finger. Works.