How do I block calls from a specific prefix?

Hi there, prefixblocking,

Thanks for stopping by the Apple Support Communities to ask about blocking calls. It sounds like you want to block all calls coming in from a specific area code/prefix. We're happy to provide you with some information.

Currently, your iPhone allows you to block individual numbers from contacting you, or it can block any number not in your contact list. There presently is not a way on the iPhone itself to block all calls from a specific area code/prefix, however. We can suggest reaching out to your wireless carrier to see if they have any options to perform that task, and you're welcome to let Apple know it's a feature you would like to see in the future: Feedback - iPhone - Apple.

For more information on blocking calls on your iPhone, check out the following articles:

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch - Apple Support

Detect and block spam phone calls - Apple Support

Have a wonderful day!