Microsoft officially announced that it had begun the rollout of the Lumia Denim update, which includes the most recent OS version.

On December 18, Microsoft officially announced that it had begun the rollout of the Lumia Denim update, which includes the most recent OS version, Windows Phone 8.1 Update. Some Lumia handsets have already received the update, but most have not, and the company said that it would expand its rollout further to more devices and markets throughout January.

But it looks like this could be the only update that devices receive before the next major version of the mobile OS is released towards the end of the year.