CNAM

CNAM, short for Caller ID Name, is the name that shows on a landline or some phones next to the incoming number, pulled from a carrier database.

When a call arrives, the number travels with the call, but the name usually does not. Instead, the receiving carrier looks up the number in a CNAM database and shows whatever name is stored there. The name is limited to 15 characters.

That leads to a few common issues:

• Different carriers use different databases, so your name can show correctly on one network and as "Unknown" or a city name on another.
• Many mobile phones do not use traditional CNAM at all. They rely on the phone's contacts, carrier apps, or analytics partners for names and labels.
• Updates can take days or weeks to spread.

To set or change your CNAM, ask your phone provider. Most let you set the display name for each number, sometimes for a small fee. Use a clear, recognizable business name within the 15-character limit.

CNAM is different from branded calling, which can show a logo and call reason on supported mobile devices, and different from spam labels, which come from carrier analytics. Setting a correct CNAM is a basic step toward a trustworthy caller ID, along with getting A attestation and registering your numbers with analytics companies.

Sources

• FCC, Caller ID and Spoofing consumer guide: https://www.fcc.gov/consumers/guides/caller-id-and-spoofing (accessed October 17, 2026)

This entry is general information, not legal advice.