How can I update my iPhone 4s to iOS 10?
To update to iOS 10.3 through iTunes, make sure you have the latest version of iTunes installed on your PC or Mac. Now connect your device to your computer and iTunes should open automatically. With iTunes open, select your device then click 'Summary' then 'Check for Update'. The iOS 10 update should appear.
Can iPhone 4s still be updated?
Your iPhone 4S can't be obsolete if Apple just released iOS 9.3.6 for it, right? Apple's support website says: “Starting November 3, 2019, some iPhone and iPad models introduced in 2012 and earlier will require an iOS update to maintain accurate GPS location and keep the correct date and time.