How to Stop Receiving Insider Preview Builds on Windows 10 Mobile Phone
Here's How:
1. Open Settings, and tap on the Update & security icon. (see screenshot below)
2. Tap on Windows Insider Program. (see screenshot below)
3. Tap on Stop Insider Preview builds. (see screenshot below)
4. Do step 5 (temporary) or step 6 (completely) below for what you want to do.
5. To Stop Getting Insider Builds for Only 1 day, 3 days, 5 days, or 7 days
A) Select
1 day,
3 days,
5 days, or
7 days for when to automatically turn on receiving Insider Preview builds, and tap on
Apply. (see screenshots below)
B) You will now stop receiving Insider Preview builds for how long you selected. (see screenshots below)

Note
If you want to start getting builds again sooner than when you set to automatically start, you can tap on Resume.
C) If you like, tap on the Start

button at the bottom of your phone to go back to your Start screen. (see screenshot below)
6. To Stop Getting Insider Builds Completely

Note
A) Tap on the
Need to stop getting Insider builds completely link. (see screenshot below)
B) Tap on
Confirm.
C) Tap on
Restart now.
That's it,
Shawn