How to download iOS 15 on my iPhone?
How to download iOS 15 in Swaziland (Africa)
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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 12.5.7
• If you have an iPhone 6S through 7, you can update to 15.7.3
• If you have an iPhone 8 or higher, you can update to 16.3.1
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 Update your iPhone or iPad - Apple Support
This link will show you how to update using your computer -
Update iOS on iPhone - Apple Support Update iOS on iPhone - Apple Support