Spam call “Hz Payback” experiment.


If you’re anything like me, fed up with incessant spam calls that disrupt your day and cause you to miss important calls, you might find my experiment intriguing. With the rising tide of spam calls, mostly originating from VoIP numbers used by robocallers, blocking them becomes a herculean task due to the ever-changing nature of these numbers. Although apps like RoboKiller, Hiya, and TrueCaller, along with some carrier options, offer some relief by filtering known spam numbers, they often fall short. New VoIP numbers proliferate by the thousands once identified as spam, never addressing the root cause. Even the national do-not-call list or simply ignoring calls doesn’t quite solve the problem.

This dilemma led me to delve into how spam call campaigns function. These campaigns utilize automated dialing systems capable of making thousands of calls per minute at a minimal cost. Their objectives vary from selling products to scamming for money or personal information. A key tactic in their arsenal is “number spoofing,” where spammers disguise their real number on your caller ID, often mimicking local or trusted numbers to encourage you to answer.

Spam call systems are adept at identifying active numbers through engagement, such as answering calls or voicemails, and even callbacks or responses to prompts. This intelligence allows them to efficiently target active phone lines, leveraging VoIP technology to evade regulatory measures effectively.

Realizing how these systems detect active lines, I embarked on the “Hz Payback” experiment. It utilizes the Special Information Tone (SIT), recognized as an indicator of a disconnected number. By combining a few seconds of this tone with a voicemail greeting and setting this as my voicemail, I aimed to trick robocallers into marking my number as inactive. I directed all spam calls to this voicemail using a spam blocker app, hoping the initial SIT would prompt the system to hang up and remove my number from their list.

Over a two-week trial, the results were promising, with a significant drop in spam calls noted in the second week after implementing the new voicemail greeting, compared to the first week without it. While this method isn’t foolproof and the test period was relatively short, it offers an innovative way to combat spam calls.

Below, I’ve shared the voicemail greeting I used for those interested in trying this method. I’m keen to hear from others about their strategies against spam calls, so feel free to leave a comment on this article with your experiences.

This exploration not only sheds light on the workings of spam calls but also introduces a novel, albeit temporary, solution to reduce their frequency. While it’s not a complete eradication of the issue, it’s a step toward reclaiming some peace from the relentless ring of spam calls.

Guy VM Greeting

Lady VM Greeting

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