With around half the world’s population expected to be carrying a mobile phone by the end of this year, it’s hard to believe that its just 35 years since the first ever public cell phone call was made. Yesterday (4/3/08) marked the anniversary of the historical call made on the streets of New York by portable cell phone inventor Martin Cooper, then general manager of Motorola’s Communications Systems Division. Not surprisingly the device used was a far-cry from the slim-line handsets of today – making even the “bricks” of the late 80’s and early 90’s seem ultra-portable. Weighing in at two and a half pounds and 10 inches long, the phone could be used for only 20 minutes before the battery died.