How can I get 13.6 upgrade for my .iPhone 6s
How can I upgrade my 6s operating system to 13.6
iPhone 6s, iOS 12
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You cannot update a 6s iPhone to 13.6. You would need to update to the most current iOS 14.2
See this link about how to update your iPhone, paying particular attention to the section on updating using your home computer with iTunes to update your phone --> Update your iPhone, iPad, or iPod touch - Apple Support