Hello there, rogerdadodger.
The following Knowledge Base article offers up some great recommendations for resolving issues with Touch ID:
Using Touch ID on iPhone
http://support.apple.com/kb/HT5883
- Make sure that you're using the latest version of iOS.
- Make sure that your fingers and the Home button are clean and dry.*
Cover the Home button completely. Don't tap too quickly, don't press down hard, and don't move your finger while Touch ID is scanning. Make sure that your finger touches the metal ring around the Home button.
- If you're using a protective case or screen protector, it must leave the Home button and the surrounding ring completely unobscured. If it doesn't, remove the case or screen protector and try again.
- Tap Settings > Touch ID & Passcode and verify that:
- iPhone Unlock or iTunes & App Store is on.
- You enrolled one or more fingerprints.
- Try enrolling a different finger.
- If you can't enroll any of your fingers, take your iPhone to an Apple Retail Store, Apple Authorized Service Provider, or contact AppleCare for further assistance.
* Moisture, lotions, sweat, oils, cuts, or dry skin might affect fingerprint recognition. Certain activities can also temporarily affect fingerprint recognition, including exercising, showering, swimming, cooking, or other conditions or changes that affect your fingerprint.
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.