This might help some of you guys, CL regardless if they use their own system or they use authentify for their phone verification, relies on the CNAM database run by verifsign.
The CNAM database is what tells carriers what name to display on callerid when someone calls your phone.
CL will not call a number that has 0 value for its name in the CNAM record. Thats why if you have a phone number that doesnt display a name when you call someone on their caller ID, CL wont call it.
It is simple to get access to CNAM and do updates, that with the know how of getting numbers for nothing will get you all you need to setup as many CL accounts you wish.
http://vcs-www.verisign.com/docs/cnam/