NEWS ANALYSIS: Nokia on Sept. 5 showed off the Lumia 920 and 820 smartphones. Their charge? Save an ailing company. Not so easy, eh? - Nokia has hit a wall. The Finnish company that once dominated the mobile market, thanks to its Symbian-based phones, is now trying desperately to prove not only to customers, but to shareholders, that it can actually reverse its fortunes and regain its past glory. On Sept. 5, the company made its be...