If you are currently a user of the Insider Program for Windows Phone, you may wonder how to un-enroll. Likewise, if you are considering jumping into the Insider Program for Windows 10 Mobile you may want reassurance that you can leave at any time.
Much like the Insider program for PCs you can enroll and leave the program at any time. This ability means that you can sign up, grab the latest "stable" release, and then leave the program. Your phone stays on that build, and you do not have to risk getting unstable beta releases.
Full story from the WindowsCentral blog...