The iOS on my iPhone is 13 and I want 14 but the update is not available on my phone
The iOS on my iPhone is 13 and I want 14 but the update is not available on my phone
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It would seem you've skipped a lot of updates if you are on iOS 13. You can connect your phone to your computer and do the update using iTunes.
See this link --> Update your iPhone, iPad, or iPod touch - Apple Support
See the section on Update your phone using your computer.