Before the announcement, Cooper called his rival Joel Engel, chief researcher at AT&T's Bell Labs, with the first cell phone in history: the Motorola DynaTac, short for 'Dynamic Adaptive Total Area Coverage'. The device was the size of a shoebox and weighed almost a kilogram, but it worked flawlessly. "We at Motorola did it, cellular telephony is a reality," Cooper told Engel in the historic first communication. Between the companies there was a tactical competition for who would get to functionally produce the first cell phone first.