Microsoft will soon take over Nokia's mobile division, but what if the deal hadn't gone through? What would both firms have done? Today it has emerged they both had a plan B ready just in case…
Nokia has been reported to have considered Android before, but according to sources speaking to The New York Times, it actually tested Google's operating system on its Lumia handsets.
This happened "well before" the deal with Microsoft was made official.
Not to be outdone, Microsoft also made its own prototype Surface handsets, in case Nokia did jump ship, sources told The Verge.
Nokia makes up 80 per cent of all Windows Phone sales, so Microsoft must be pretty pleased it's bringing the Finnish firm on board.
The Redmond-based company is said to have known that Nokia was testing Android on its handsets, though apparently it wasn't mentioned during the discussions.
Nokia signed a deal to use Microsoft's Windows Phone OS back in 2011, but that would have run out in 2014, which is when Nokia could have switched to Android. It's previously said it didn't opt for Google's OS because it feared Samsung would come to dominate it.
A couple of weeks ago, Microsoft announced it was buying Nokia's mobile division. The deal will be complete early next year. Before then, Nokia is expected to launch the Lumia 1520 bandit, its first 6-inch handset.