Associate has talked to Apple employees on the availability of certain operational deficiencies at the sensor Touch ID, integrated in the Home button . Apple representatives have admitted that during the tests, it was found that the authentication is not always successful, if user touch the sensor with a wet finger. Furthermore, some people with skin lesions on the fingertips problems also arise.
Also Apple will still use the numeric password that must be entered when an attempt to unlock the smartphone with finger touch fail, and every time you reboot your smartphone .
For security reasons, Apple did not provide third-party developers access to the technology of biometric authentication. Moreover, even stored in a secure processor information used for user authentication by fingerprint, can not be used for imaging a fingerprint.