Apple Beta software :
After installing beta profile to your iOS device , you'll get the latest beta iOS version.
CAUTION : Create A Backup Of Your Data Before Installing Beta Profile !
Here's how to install beta profile:
1# On your iOS device , launch Safari browser , then go to : https://beta.apple.com/profile/
2# Enter your iCloud data and Sign in .
You should receive notification on your other ios devices , and you get a verification number too.