[time-nuts] time sync from cellphone TO microcomputer

[Mark Sims]

Check out the ESP8266 based wi-fi modules.  They are dirt cheap (< $5) and tend to have excellent range.  Sparkfun has some that are nice (and more expensive) that break out all the processor pins.  The ESP8266 is a 32-bit processor with on-chip wifi.  The ESP8266 are now supported in the Arduino environment.  
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If you want to use a uC as receiving partner, i would go for BT/BTLE
rather then wifi as it's easier to setup.