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Have Blood Donors Stopped Answering Your Calls?

Updated: Jul 22, 2023

Discover reasons your blood center may be experiencing declining contact rates and what you can do about it by examining consumer behavior, call labeling, attestation ratings, analytics engines, and caller ID monitoring.


It's crucial to acknowledge the significant changes in consumer behavior in recent years. Americans are addicted to their cell phones, social media, texting, games, and surfing the Internet. The average person is spending 3-4 hours a day on their cell phone. So, why don’t people answer phone calls? The answer lies in the explosion of robocalls and scam calls.

Recent studies show 87% of people don’t answer calls from unknown numbers and less than 6% pick up when a call is labeled as Scam/Spam.

In 2022, Americans were swindled out of approximately $87 billion by robocalls and phone scams, marking a staggering 116% increase from the previous year.

In 2021, a single scam group in India made an astonishing 200 million scam calls, averaging over 27,000 scam attempts per hour.

It’s no wonder we are screening our calls. We get tired of hanging up on the car warranty guy for the 15th time.

The FCC has jumped in to make combatting unlawful robocalls and malicious caller ID spoofing a top consumer protection priority by implementing rules like Caller ID Authentication (STIR/SHAKEN) and major fines for bad actors.

Cellular carriers are also taking steps to safeguard consumers by implementing call labeling algorithms. This will enable phone numbers with suspicious behavior to be identified and labeled accordingly, giving consumers more information before they answer a call. These measures are essential in the fight against illegitimate robocalls and scammers.

While this author agrees that these measures are necessary and are having a positive impact on protecting consumers, it's also true that blood centers are facing serious challenges in connecting with their donors due to the implementation of call labeling algorithms. It's crucial to strike a balance between protecting consumers and ensuring that we keep the nations blood supply safe.

With that said, let’s take a deeper dive into STIR/SHAKEN, call labeling algorithms, and what blood centers can do to protect their brand and engage their donors.


It's not a James Bond Martini order... if you're not "tech minded" you may want one after reading this.

The FCC implemented STIR/SHAKEN in 2021.

STIR/SHAKEN uses digital certificates, based on common public key cryptography techniques, to ensure the calling number of a telephone call is secure. In simple terms, each telephone service provider obtains their digital certificate from a certificate authority that is trusted by other telephone service providers. The certificate technology enables the called party to verify that the calling number is accurate and has not been spoofed.

Here is why this is important for your blood center: The originating telephone service provider checks the call source and calling number to determine how to “Attest” for the validity of the calling number and gives it a rating of A, B, or C.

An attestation rating of C means that the telecom carrier does not know the caller's identity, and some carriers have a policy to block all calls that are transmitted with a C attestation, which means if you have a C attestation your calls are probably not getting through. They don’t tell you; they just don’t put them through.

It's important your blood center take responsibility for checking your attestation rating, rather than solely relying on your phone provider to do so. While STIR/SHAKEN is a positive development for consumer protection, it's worth noting that there are still some issues that need to be addressed. However, by following best practices and ensuring compliance, your blood center can avoid potential issues with attestation ratings.


Call labeling is designed to inform customers about the calls they are receiving so they can decide whether to answer. Carriers break labels into two categories: warning and intent.

Warning labels, such as potential spam, spam risk, scam likely, fraud risk, and others, are meant to alert users of potential dangers. On the other hand, intent labels, which include charity/non-profit, informational, political, survey, and others, are used to indicate the purpose of the call.

Unfortunately, carriers often incorrectly apply negative labels to legitimate calls, which can be frustrating for your blood center and donors. It's important to be aware of the potential for mislabeling and take steps to prevent it from happening. By doing so you can ensure that your calls are labeled accurately and avoid any misunderstandings with donors.

Carriers employ complex algorithms for labeling calls, and they don't openly share this information for obvious reasons. However, over time, we have discovered certain behaviors the carriers analyze to determine whether a call should be flagged. Here are a couple of examples:


One data point carriers look at is call volume. For example, if you place over 100 calls that originate from the same phone number in the same day, it's likely you'll get flagged because it could be viewed as suspicious.


Another example is Audio Fingerprinting, which uses algorithms to analyze sound files and create digital summaries of their content. This technology recognizes calls that use the same recorded messages to reach consumers. When it detects the same message from different numbers, it suspects those numbers are making scam calls and will apply a negative label.

It's important to follow best practices when it comes to making phone calls to avoid being flagged as a potential scam caller. With that said, because the algorithms are unpredictable, even if you do everything right, you can still get flagged. At 448 Connect, we follow best practices and monitor all our phone numbers, and even our President's cell phone was flagged recently. We've also seen numbers with very low call volumes get flagged regularly. It's just a reminder you have to be proactive and vigilant.

So, what can you do to protect your blood center and donors?


To check your attestation rating, call an attestation phone number checker who will provide this information (448 Connect can provide you a phone number). The process may be a bit time-consuming, but it's worth it to ensure that your calls are authenticated and that your customers aren’t seeing spam/scam when you call them. Remember to also check with your phone provider to ensure that they have implemented STIR/SHAKEN.


To ensure your phone numbers are not flagged, you should subscribe to a service that monitors your phone numbers across different carriers. This will help you stay informed and alert you when a phone number is flagged. Unfortunately, carriers do not make a database of "flagged" numbers available. The only way to check if your phone number is flagged is by calling a phone on that network to see how it displays. To do this efficiently, a device cloud is used, which are large arrays of cell phones where screenshots are taken of the display. This data is then used to notify customers when a negative label is identified, making it a unique and effective solution to this problem.


It's worth considering utilizing a newer technology called Branded Calling. Although caller ID has been around for ages, this "new" caller ID is designed specifically for cell phones and has a maximum character limit of 32, making it more reliable and allowing room for creativity, such as including the reason for the call. This technology also shows the brand in the call log, which is a plus. It's important to note that the old landline caller ID (CNAM) doesn't work on cell phones unless you, as the consumer, have downloaded and installed a caller ID app, which less than 10% of consumers do. Branded Calling is a great solution and can help your blood center stand out while ensuring the authenticity and safety of your phone calls.

To give your blood center the best chance of connecting with donors while protecting your brand, and caller id reputation, it's important to consider using technologies like phone number monitoring and branded calling.


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