Merging technologies makes a fun business
What do you get by merging a half-a-century-old technology (as in rotary dial phone) with a modern technology (as in GSM)? You get a Portable Rotary Cellular Phone or Port-O-Rotary for short. And this is what guys from SparkFun offer at a modest price of $200 (or $250 for a fire-brigade-red model).
They describe their invention in details (along with schematics and programming code) on their website at SparkFun Electronics. It’s a fun and educational read, so head there and read it. There’s a lot of fine pictures there too! 
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