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You can set your phone to use your fingerprint as phone lock code or to authorise iTunes and App Store purchases.
1. Find "Touch ID & Passcode"
2. Add fingerprint
Follow the instructions on the display to add a fingerprint.
Key in a phone lock code of your own choice.
Key in the same phone lock code again.
3. Select settings for Touch ID
Press the indicator next to "iPhone Unlock" until the function is turned on.
Press the indicator next to "iTunes & App Store" until the function is turned on.
4. Return to the home screen
5. Use Touch ID
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