after i update my i phone 6plus why it always restarting? It restart automatically every 10minutes . What will I do to fix my phone? can’t you used it anymore. :(

You can try erasing the device in the settings. Backup first with iCloud, then restore the backup.

I prefer using iTunes because iTunes will download and install a new, clean copy of the iOS software whereas erasing the device in the settings will not download another copy of the iOS. That’s not to say that it won’t help, I just don’t think it is as effective as using iTunes

How to make an iCloud backup.

How to back up your iPhone, iPad, and iPod touch - Apple Support

How to restore the iCloud backup.

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

If you are uncomfortable with this, make an appointment at an Apple Store and ask for their help.

I would make a backup, restore the phone to factory settings using iTunes and then restore the backup and see if that fixes it.

Restore your iPhone, iPad, or iPod to factory settings - Apple Support