This can also be done on CDMA via Qualcomm QXDM and qCAT for logging, enabling you to just have a single cell phone, a laptop and some scripting in QXDM to log.<p>Of course this would mean you have access to unlicensed Qualcomm software, know a bit about interfacing with the radio of CDMA phones and qCAT will correctly parse it to meaningful data.<p>On the other hand, you can also log numbers being actively dialed and even intercept text messages on the SMS paging channel if you happen to have the correct UM/AN on the phone (ESN/MEID not needed)<p>But with the eventual shut down of CDMA, this sort of phreaking is long lost and over.