4:35 PM -- What operating system Nokia Corp. (NYSE: NOK) should adopt has stirred up a lot of debate (just look at our message boards).

It's obviously caused dissension within Nokia too, as CEO Stephen Elop revealed to AllThingsD this week. (See Top 5 Candidates for Nokia's Exec Shakeup.)

Windows Phone 7, Android, MeeGo or some combination thereof have all been suggested for Nokia, but no matter which it decides to lean on to reinvigorate its handset business, it won't be an easy task.

The Finnish handset maker will have to move faster to keep pace with the competition and convince three groups -- wireless operators, developers and consumers -- that it will consistently follow through on doing this. Elop's "Burning Platform" memo suggests he's ready to, but it all hangs in the execution. (See Nokia's 'Burning Platform' Memo .)

As Jan Dawson, chief telecom analyst at Ovum Ltd. , pointed out on Twitter, if Nokia is serious about North America, a 2:30 a.m. EST materials release followed by a 5 a.m. EST press conference isn't the best strategy. Nonetheless, night owls at Light Reading Mobile will tune in for the play-by-play -- whatever that may be.

— Sarah Reedy, Senior Reporter, Light Reading Mobile