We've known that AT&T would have exclusive rights to the Nokia Lumia 920 in the US for some time now but just how long that exclusivity would last has remained a mystery - until now. The latest news indicates the smartphone will remain an AT&T-only product for six months before being made available to other carriers.

WPCentral got their hands on a couple of purported AT&T training videos for the upcoming Windows Phone 8 handset. Highlighted in the footage are a few notable features like wireless charging, Nokia City Lens and Tap + Send using NFC technology. It's in one of these clips, however, that we find the six month exclusive claim.

The videos all have a high production value with lots of hands-on action with the 920. If I was a betting man, I'd say the videos are genuine and AT&T will indeed have a six month head start with Nokia's flagship.

Six months may not seem like a long time to hold exclusive rights over something but in the fast-paced mobile phone industry, it's practically an eternity. By the time other carriers are permitted to stock the 920 sometime in early May 2013, it will be old news. The odds of people holding out half a year to pick up a phone that would be equally as dated seems really slim if you ask me.

In the meantime, Microsoft has scheduled a media event for October 29 in San Francisco where they plan to showcase Windows Phone 8.