How to Activate Touch ID on iPhone 6s?

Activating Touch ID on your iPhone 6s allows you to use your fingerprint to unlock your device, authorize purchases, and sign in to apps. Here's how:

Setting Up Touch ID on iPhone 6s

Go to Settings: Open the Settings app on your iPhone 6s. This is typically represented by a gray icon with gears.
Navigate to Touch ID & Passcode: Scroll down and tap on "Touch ID & Passcode". You may be prompted to enter your passcode for security.
Enroll a Fingerprint: Tap "Add a Fingerprint".
Follow On-Screen Instructions: Carefully follow the on-screen instructions. You'll need to place your finger on the Home button, ensuring complete coverage, multiple times until the iPhone registers your fingerprint accurately. The process involves multiple scans to capture the different parts and edges of your fingerprint. (As seen in reference videos demonstrating the setup process.)
Choose Your Applications: Once your fingerprint is successfully registered, you can choose which features will utilize Touch ID, such as unlocking your phone, authorizing purchases on iTunes & App Store, and signing into third-party apps. (Referencing Apple's support documentation on Touch ID setup.)

If you're having trouble activating Touch ID:

Ensure iOS is Updated: Make sure your iPhone 6s is running the latest version of iOS. Software updates often include bug fixes that may resolve Touch ID issues. (Based on Apple Community discussions regarding Touch ID problems and iOS updates.)
Clean the Home Button: A dirty or smudged Home button can interfere with fingerprint recognition. Clean it gently with a soft, dry cloth.
Hardware Issues: If the problem persists, there may be a hardware issue with your Home button. Contact Apple Support or an authorized service provider for repair. (Apple Community discussions frequently mention hardware problems as a cause of Touch ID failure.)

Remember to keep your fingerprint data secure and avoid sharing it with others.