What does the iOS 15.7 do
To let people know what it’s ios15.7 is about
• 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
• If you have an iPhone 8 or higher, you can update to 16.0.2
Go to Settings > General > Software Update.
Update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone or iPad - Apple Support
Update using your computer -
Update iOS on iPhone - Apple Support