Why not update automatically my phone?
My phone need updating but automatically doesn’t work
iPhone 6s, iOS 13
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Update your iPhone, iPad, or iPod touch
• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.6
• If you have an iPhone 6S through 7, you can update to 15.7.2
• If you have an iPhone 8 or higher, you can update to 16.2
Go to Settings > General > Software Update.
This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone or iPad - Apple Support
This link will show you how to update using your computer -
Update iOS on iPhone - Apple Support