Is the iPhone 6S Qi– certified?

6s doesn't support wireless charging, no matter which standard. (Qi)

Wireless Charging requires a glass back and it is possible with the

• iPhone 8
• iPhone 8 Plus
• iPhone X
• iPhone Xs
• iPhone Xs Max
• iPhone Xr

No. The iPhone 6 does not even support wireless charging. Let alone be certified for the Qi type.

The iPhone 6 would require a wireless charging case, and it would then be the case that would need to be Qi certified.

For instance: https://www.amazon.com/slp/slim-wireless-charging-case-iphone-6/54tvquw7x73t8pj

While the iPhone 6S doesn't have built in wireless charging, there are cases available that will allow you to use wireless chargers. I've been using them since I had an iPhone 6. I now have a 7 Plus with a wireless charging case. I think it was about $15 dollars on Amazon.

No.

The first iPhone models that would work with Qi are the iPhone 8/8 Plus and iPhone X. All iPhone models from the iPhone 5 to iPhone 6 only charge via a Lightning cable.

Quick self correction - that's the iPhone 5 to iPhone 7 series only charging via Lightning. So that would mean the iPhone 5, 5s, 6, 6 Plus, 6s, 6s Plus, 7, and 7 Plus.