My phone started up at 6am like it always does but now I can not get into it as it has changed my pin from a 7 digit to a 6 digit PIN? This is not acceptable the phone is like 9 months old. and you only get a few guesses before it keeps you barred for 30 seconds. Why will it not accept fingerprint? Biometrics are supposedly more secure than a 4-8 digit PIN