Download and install iPhone Configuration Utility from here: Windows, Mac
Launch iPhone Configuration Utility
Select Configuration Profiles from the Library at the left of the window.
Click the New button from the toolbar
In the General section of the new profile input a name and identifier for the profile. We named our profile iClarified and set our identifier to com.iclarified.alphanumericpasscode in the example.
Click to select the Passcode section for the new profile. When prompted click the Configure button.
You can now specify the requirements for your password. Select the Require passcode on device then configure the many settings possible.
These settings include:
- Require alphanumeric value
- Minimum passcode length
- Minimum number of complex characters
- Maximum passcode age
- Passcode history
- Grace period for device lock
- Maximum number of failed attempts
Once you have made all the desired changes to the Passcode section click the Share button on your toolbar.
If required you can sign the configuration profile; otherwise, select None from the security dropdown and click the Share... button.
A new email will be created with the mobileconfig file already attached. Email this file to an address accessible on your iPhone.
Access the email on your iPhone and press to open the attached mobileconfig file.
From the Install Profile screen press the Install button.
A popup window will appear asking you to configure the installation. Press to select the Install Now button.
You will now be asked to set a Passcode that meets the requirements you specified earlier.
*Inspired by 9to5Mac