Can I update to iOS 15.7.2 on iPhone 6s ?

Yes it's possible.

• If you have an iPhone 5S or 6/6plus, the highest you can update to is 12.5.6

• If you have an iPhone 6S through 7, you can update to 15.7.2

• If you have an iPhone 8 or higher, you can update to 16.2

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

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support

LLWMWANGR Said:

"How do I upgrade to iOS 15.7.2 on iPhone 6s? Is it possible?"

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Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Update your iPhone Using a Computer - User Tip. If anything is available, it will install, Sur enough.

Can you update my iso to 15.7.2