I was thinking of using the esp8266 module as the main MCU and hooking up a few things:
- I have a esp module (not sure which one)
- nokia lcd screen ($2.36 cost free shipping) http://www.ebay.com/itm/For-Nokia-5110- ... 3ce6dbb789
- 2.4 ghz transceiver module ($0.96 cost) http://www.ebay.com/itm/1Pcs-Wireless-T ... 19e9e6be43
I sadly do not have any skills in soldering or electronics but the total cost of this smartwatch could be $15
Not to mention you can use the freedompop free 500 mb data (for free wifi data) and since today is cyber money you can get the usb for free http://freedompop.com/
(sorry if this sounds like a advertisement, just listing the prices and locations to make this cheap smart watch)
I just wish I knew how to solder, I am more of a programmer.