Microsoft just announced the newest version of Windows. They are allowing adventurous users to try it out for free.

You can reserve your free upgrade in the Get Windows 10 App. Once you reserve, Windows 10 will download when available, and you can cancel your reservation at any time

This upgrade offer is for a full version of Windows 10, not a trial. 3GB download required; standard data rates apply. To take advantage of this free offer, you must upgrade to Windows 10 within one year of availability. Once you upgrade, you have Windows 10 for free on that device