Microsoft recently launched the Lumia 950 in the United States, and the Lumia 950 XL is expected to go on sale soon as well. Both of the phones come with Windows 10 Mobile Build 10586.0 – however, if you want to get the latest Windows 10 Mobile build (10586.11), you can only get it from the Windows Insider program. Unfortunately, though, both of the phones aren’t supported by the Windows Insider program just yet.
@zeke_again Not yet, we need to get some support in place for 950 & 950XL to enable them for Insider Previews
— Gabriel Aul (@GabeAul) November 20, 2015
Of course, Microsoft needs to have some support for the devices available before Insider builds are available to the phones. However, we should note that this shouldn’t take long and the Insider program should offer Insider builds for the Lumia 950 and 950 XL sometime soon.