You can configure the 'Using Email Mandatory (Prepaid/Postpaid Enrollment) (SC10)' setting to make email a required field during the prepaid and postpaid purchase process.

By setting this option to 'Y', email will be mandatory.

By setting this option to 'N', email will be non-mandatory.

To enable or disable this Configuration, follow these steps:

1. Go to User Settings(PC480).
2. Navigate to System Config(PC234).
3. Locate Email Mandatory (Prepaid Postpaid Enrollment)(SC10) under Enrollment section.
4. Select Y or N based on your preference.
5. Submit. Log out and log back to see the changes.