Has your phone number been reported as potential spam?
(Example of "suspected spam" call)
(Example of suspected spam on a mobile device)
Telecom operators use analytics engines to monitor call traffic patterns and flag suspicious activity. These engines label calls as likely sales, spam, or scam to protect consumers from potentially harmful calls.
Unfortunately, these systems can sometimes mistakenly flag legitimate business calls. The specific algorithms used are not publicly disclosed and are regularly updated to prevent abuse by spammers.
In the U.S., the three major carriers each rely on their own analytics partners:
Verizon – TNS (Transaction Network Services)
T-Mobile – First Orion
AT&T – Hiya
How to resolve this for future calls
Register Numbers in Hiya Connect
Hiya Connect registers your numbers in carrier-level spam detection systems. This is one of the most effective ways to protect your outbound numbers and improve contact rates.
Why Hiya Connect?
Each U.S. carrier uses its own analytics engine, but Hiya Connect not only covers these major analytics engines, but also:
Works with Samsung devices globally
Syncs with all Hiya-partnered carriers worldwide (So if you're based in Ireland, you can still benefit from that)
Alternatively, you can register your numbers individually with each U.S. carrier or use the Free Caller Registry, a unified portal supporting all three engines. But Hiya remains the strongest and most comprehensive option.
Other spam-filtering systems
In addition to Hiya, many smartphones and mobile users rely on third-party apps or network-level filtering systems that may label calls as spam, especially if the number is unknown or unregistered.
Examples include:
Truecaller
Whoscall
Robokiller
YouMail
CallApp
CallTransparency
These apps may independently flag numbers based on user reports, call patterns, or reputation databases.
Additional Measures (USA only)
STIR/SHAKEN
STIR/SHAKEN is a set of call authentication protocols designed to block fraudulent and illegal robocalls. U.S. telecom carriers use this framework to verify the legitimacy of calls by checking their origin through authentication tokens.
At NUACOM, we can register your business and numbers with carriers to ensure your calls receive an A-level Attestation, the highest trust rating.
This significantly boosts your caller's legitimacy and helps avoid unnecessary blocks.
CNAM (Caller ID Name)
CNAM displays a business name (up to 15 characters) on the recipient’s Caller ID.
Key Details:
CNAM uploads your business name to a centralised database used by telecom carriers.
Currently supported only in the United States.
It relies on decentralised databases originally built for landline networks, which can lead to inconsistencies or outdated caller info.
Offers limited control over how your business appears to the recipient.
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