Not unable to update my phone
Dear sir
I’m not unable to update my phone with new Update version Can you please check
iPhone 6s
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The iPhone 6S can be updated to iOS 15.7.1. To accomplish this, see: Update your iPhone, iPad, or iPod touch - Apple Support
And: If your iPhone, iPad, or iPod touch won't update - Apple Support
If the above Apple articles do not help, please post back with relevant information.