Yes and I increased my screen pass code from 4 digits.
My suggestion to folks that have TouchID equipped devices is to use their AppleID password (p/w) for both their screen and iCloud Keychain unlock passcodes:
1. reset your passcode:
>settings
>TouchID & Passcode
>Enter old passcode
>Change Passcode
>Enter old passcode
>Passcode Options
>Custom Alphanumeric Passcode
>enter your AppleID password
>Use for iCloud Keychain? = yes
Notes:
a. A typical p/w is generally longer than a passcode, but if you use TouchID, you rarely have to enter them so the length difference is trivial;
b. Benefit of using AppleID p/w for lockscreen and iCloud Keychain passcodes is that you don't have to remember 3 separate "passthings", and by reusing the AppleID p/w in this way, you will be refreshing it in your mind each time you use it;
c. A note of caution: jealously protect your AppleID p/w as it is one of your most important p/ws. Don't share it. If you write it down, put it in a safe location. If you enter it in public, make sure you do it out of sight of prying eyes;
d. If you change any of your passthings (AppleID p/w, screen lock passcode, iCloud Keychain passcode, don't forget to change the others as well;
e. The screen lock passcode won't let you sequentially use the same code over again, so if for some reason you change this, you need to keep 1d above in mind.
2. set/reset your SIM PIN code:
>settings
>Phone
>SIM PIN
>turn on
>change PIN
>change to last 4-digits of your iPhone telephone number
Notes:
a. The reason for setting a SIM PIN is that if your phone is lost/stolen, a PIN protected SIM can't be pulled out of your phone and used by an unauthorized party;
b. The reason for relating your PIN to your phone number is so you can easily remember it, because there are several conditions under which the iPhone will demand the SIM PIN (I.e. Restarts after empty battery or s/w updates);
c. For security reasons, SIM PINs are randomly generated by phone companies at the time the SIM is manufactured, so that not every SIM card has the same default PIN. This is good for security but hard for users because they are randomly abstract and thus PINs are easy for many folks to forget;
b. Even folks (like Ali G) who can't remember their PIN codes, can usually remember their phone numbers, thus this eliminates the need to keep (or lose) the SIM carrier card issued by the phone company (or to write it down on a scrap of paper);
c. Thieves or finders of your phone won't know your phone number*, so any PIN derived from your phone number is randomly abstract to them;
* Unless they know you, or they get it via other means (i.e. By also stealing your wallet with a business card, receipt, or other item with your phone number on it);
d. For obvious reasons, it would not be too intelligent to have your phone number written on the case or inside a cover.
© 2016 Robert.Walter
Comment or feedback is welcomed.