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Call Guardian

Helping you identify spam and block robocalls for free. 

Stronger, Smarter protection.

Robocalls are worse than annoying. They’re dangerous. Our combination of Call Guardian and STIR/SHAKEN protocol gives you more protection from scamming, spamming and spoofing to lower your risk of identity theft and data theft.

We're providing our customers with a double layer of protection against unwanted spam and robocalls. NTW is utilizing the STIR/SHAKEN protocol, an industry-standard caller ID technology, that allows for the authentication and verification of caller ID information for calls carried over Internet Protocol (IP) networks in addition to  Call Guardian for potential spam identification and verification. Our network is analyzing every call using A.I., machine learning and patented technologies to protect our customers. 

Frequently Asked Questions

What is a robocall?

A robocall is an automated telephone call delivering a recorded message. The term robocall is often used to reference other types of calls made by spammers, spoofers, scammers, and more.

Are all robocalls being blocked?

No, some robocalls are helpful, like appointment confirmations and public notices, while others are meant to cause harm. The harmful robocalls are the ones we're working to identify and block. Spoofers can be especially difficult to block due to the various methods they use to hide their telephone number.

What calls are being blocked?

Our solution aims to block as many of the calls made with malicious intent as possible. The calls have the potential to invade your privacy through identity theft, money scams, and other forms of fraud. Those that appear to have moderate risk but are not confirmed as dangerous will be flagged and may appear as "Possible Scam", "Possible Spam", or "Possible Fraud". Our goal is to give you as much information as possible for your protection.

How are these harmful calls identified?

Our solution relies on data from multiple sources including Carrier Partner Data, SIP Origination, and crowd-sourced feedback. All of these sources work together to create a "reputation score" that we use to determine the security risk of that caller and block those that represent a high risk.

What do I do if I think a call or my number is being wrongly blocked?

To mark your number as "trusted" in all national databases, please use this link: This will ensure you are not being labeled as nuisance or fraudulent on any network utilizing the national databases. If you continue to experience this issue, simply let us know that you feel a telephone number is being blocked in error. We can ensure the number will be allowed through our network and will investigate why it was blocked. 

How can I report malicious robocalls?

If you want to report a robocaller, spoofer, or scammer, visit and feel free to add your number to the Nationwide Do Not Call Registry at If you receive an unwanted call after your number has been on the National Registry for 31 days, report it to the FTC.

What if I don't want any of my incoming calls blocked?

Please let us know if you would like to opt-out of this free call-blocking service.