Whereas Nomorobo's global database is in the millions, Robokiller's 1.5 billion-number blocklist provides more thorough coverage against spam calls. Robokiller also offers audio fingerprinting, which helps protect users from call ID spoofing and detects scam calls by voice, not just the numbers they call from.

Users can take collective action against robocallers by opting to join Spam Patrol, where they train the Robokiller algorithm to protect themselves and others from spam calls. By reporting spam calls to us, you can help make our community even safer.

Robokiller is free to download. A subscription is required to use the service, but you can try it out completely free for 7 days. Once the trial ends, your subscription will automatically renew and you'll be billed.

Robokiller uses a predictive spam call-blocking algorithm that analyzes incoming calls and identifies whether they're spam in less than a millisecond - well before they can ring your phone.

Robokiller uses predictive analytics and audio fingerprinting to stop spam. Powerful scam protection = peace of mind. Robokiller protects you from over 1 billion known phone scams. To date, we've prevented more than $600 million in losses.

Robokiller is free to download. A subscription is required to use the service, but you can try it out completely free for 7 days. Once the trial ends, your subscription will automatically renew and you'll be billed.

A robocall is a call that delivers an automated or pre-recorded voice message – sometimes they are legal and take place with customer consent. What is a spam call? A spam call is an unsolicited call where the intention is often to trick or scam the recipient.

A spam filter is a program used to detect unsolicited, unwanted and virus-infected emails and prevent those messages from getting to a user's inbox. Like other types of filtering programs, a spam filter looks for specific criteria on which to base its judgments.

You can register your numbers on the national Do Not Call list at no cost by calling 1-888-382-1222 (voice) or 1-866-290-4236 (TTY). You must call from the phone number you wish to register.

Robokiller uses predictive analytics and audio fingerprinting to stop spam. Powerful scam protection = peace of mind. Robokiller protects you from over 1 billion known phone scams. To date, we've prevented more than $600 million in losses.

RoboKiller has two primary plans available to users that include the same features, but are billed differently. The Monthly Protection Plan is $4.99 per month and is billed on a monthly basis. The Annual Protection Plan is $3.33 per month but is billed annually at $39.99.

Spam includes all forms of unwanted communications including, but not limited to: unsolicited calls or messages, Caller ID spoofing, robocalls, etc. Typically, spam is directed to large numbers of users for the purposes of advertising, phishing, spreading malware, etc.