Nokia (NYSE:NOK) slashes the price of its flagship Lumia 900 phone by half in the U.S., barely a quarter after its introduction - though it's not clear whether Nokia or partner AT&T (NYSE:T) will take the bigger hit. Quick price drops aren't unprecedented, but NOK (with market cap now down more than 95% from its tech-boom peak) is under scrutiny after a lackluster Lumia rollout.