In the US and Canada, most telcos do provide calling name service. However, calls from cellular phones come in with a string like "Cellular Caller" or similar. Since a name is already present, that prevents CME's functionality to associate a name configured as "directory entry".
The result is that you cannot associate a name to know cellular phones numbers.
This limitation is now resolved sing my script remove-cname, you can now define which of these string from telco are to be stripped to allow CME number lookup.