There are two main reasons why you might see your regular phone contacts in the 2nd Phone Number app:
Contact Syncing: When you first install the 2nd Phone Number app, it might request permission to access your phone's contacts. This permission allows the app to sync your existing contacts, making it easier to find and call people you already know using your 2nd Phone Number.
Privacy Settings: Granting permission for contact syncing is optional. You can still use the 2nd Phone Number app even if you choose not to sync your contacts.
Here's how to control which contacts appear in the 2nd Phone Number app:
Open the Settings app on your iPhone.
Scroll down and tap on "2nd Phone Number".
Look for the option labeled "Contacts".
Toggle the switch ON to allow syncing or OFF to prevent syncing your phone's contacts with the 2nd Phone Number app.
Remember: Granting permission for contact syncing is entirely up to you. Choose the option that best suits your privacy preferences.