Included in the upgrade is the Windows Phone 8.1 OS update which launched on the Lumia 630, 635 and 930, bringing with it a raft of new features including a pull-down notification bar with quick settings, word flow keyboard and an optional extra column of live tiles on your homescreen.
If you're lucky enough to be in the US you'll also get Microsoft's new personal virtual assistant - Cortana - who will be going head to head with Siri and Google Now. It will be heading to other countries later this year.
As well as Microsoft features, the Cyan update is Nokia-specific with enhancements to the camera and camera roll, the option to record in surround sound (on the Lumia 1520 and Lumia Icon), the ability to install apps on a microSD card and more.
Full details of what the Cyan update entails can be found on the Nokia Conversations blog, although Microsoft does highlight that it will take a few weeks to reach every handset.
- Read our in depth Windows Phone 8.1 review
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John joined TechRadar over a decade ago as Staff Writer for Phones, and over the years has built up a vast knowledge of the tech industry. He's interviewed CEOs from some of the world's biggest tech firms, visited their HQs and has appeared on live TV and radio, including Sky News, BBC News, BBC World News, Al Jazeera, LBC and BBC Radio 4. Originally specializing in phones, tablets and wearables, John is now TechRadar's resident automotive expert, reviewing the latest and greatest EVs and PHEVs on the market. John also looks after the day-to-day running of the site.