Glossary Phone numbers
What is CNAM?
Also called caller id name, calling name, caller name display
CNAM, short for Calling Name, is the text displayed next to your phone number when you call someone. It is not carried with the call. The receiving carrier takes the calling number, looks it up in a database, and displays whatever it finds, which is why the same call can show different names on different networks.
Why your name shows up wrong
Because CNAM is a lookup rather than something you send, correcting it means updating the databases that carriers query, and then waiting for caches to expire. A number that used to belong to another business can keep showing that business's name for some time. Mobile carriers increasingly bypass CNAM entirely in favour of their own analytics, which is a separate system with its own rules.
CNAM and being labelled as spam
CNAM is often confused with the "Spam Likely" warnings that mobile networks display. They are different mechanisms: one is a name lookup, the other is a reputation score calculated from calling patterns. Fixing your CNAM record will not clear a spam label, and clearing a spam label will not correct your CNAM.
Setting it well
You get fifteen characters, so choose them deliberately. A recognisable trading name beats a legal entity name that nobody would recognise, and beats an abbreviation that looks like spam. Consistency across all your numbers matters too: a caller who has saved one of your numbers under a name and then sees something different from another is less likely to answer. Set it once, apply it everywhere, and check what actually displays by calling a mobile on a different network.