What is how to block no caller id on iphone?

Unfortunately, iPhones don't offer a direct setting to universally block all calls from numbers that display as "No Caller ID," "Unknown," or "Private Number". However, you can use workarounds:

Here are some common approaches to manage these types of calls:

• Silence Unknown Callers: A built-in iPhone feature sends calls from numbers not in your contacts list directly to voicemail. This can help reduce the number of unwanted calls you receive. You can find this in Settings -> Phone -> Silence Unknown Callers. Although it doesn't block the calls, it keeps your phone from ringing. Silence%20Unknown%20Callers

• Contact Your Carrier: Many mobile carriers offer services or apps that provide enhanced call blocking and filtering options. Check with your carrier to see if they have features that can help block these types of calls. Contact%20Your%20Carrier

• Third-Party Apps: There are numerous third-party apps available in the App Store that specialize in call blocking and identification. These apps often use crowdsourced databases to identify and block spam or unwanted calls, including those with no caller ID. Be sure to research and choose reputable apps with good reviews and privacy policies. Third-Party%20Apps

• Manual Blocking (After the Call): While not a proactive solution, after receiving a call from a "No Caller ID" number, you might be able to block the number if it leaves a voicemail. In the voicemail section of the Phone app, you might be able to see a number and then block it. This depends on whether any identifying information was transmitted despite the caller ID being hidden.

It's important to understand that callers who block their caller ID do so intentionally, so it can be difficult to completely prevent these calls from reaching you.