Hacker and information broker
Call a number on a pay phone (not a real number, not one that should be valid) and leave a bank account number. He (she?) will call back in an hour. Zer0 can track down publicly available info and some that isn’t. If you can pay.
Network 2 (out of original 4)
“Robin” knows Zer0’s number and used it to track down Georg Rudek. Too bad he was dead already.