How do I remove 31 from my iPhone?

How do I remove 31 from my iPhone? Go to Settings > Phone > Show My Caller ID option. 2. On the next screen, move the toggle next to Show My Caller ID to OFF position. After this, others won’t be able to see your Phone Number or Name, whenever you make a Call from iPhone to anyone.

Go to Settings > Phone > Show My Caller ID option. 2. On the next screen, move the toggle next to Show My Caller ID to OFF position. After this, others won’t be able to see your Phone Number or Name, whenever you make a Call from iPhone to anyone.