Why is my finger too dry or too cold?

The fingerprint scanner only works correctly and reliably with the papillary ridges of the front phalanx. If your finger is too dry or too cold, these papillary ridges cannot be adequately registered. Try the following:

• You can warm a cold finger with friction.
• With dry skin, it often helps to run your finger across your forehead.
• If possible, use a different finger.