Use this guide if your new display assembly comes with the [https://www.ifixit.com/Guide/iPhone+6s+Plus+Front+Panel+Replacement/50676#s113005|front-facing camera and sensor assembly] and the [https://www.ifixit.com/Guide/iPhone+6s+Plus+Front+Panel+Replacement/50676#s110180|display EMI shield] already installed. All you need to do is remove the old display assembly and transfer the home button to the new display assembly. |
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If your replacement display does not include those parts, follow the longer version of this guide [https://www.ifixit.com/Guide/iPhone+6s+Plus+Front+Panel+Replacement/50676#s110173|here]. |
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In either case, it's important to transfer the original home button onto the new display in order for Touch ID to function. |