Between an "SGSN" and "GGSN", since all bytes of data for a given subscriber are being forwarded between them (associated with the IMSI number of your SIM card, and *not* typically the IMEI of the device), they can count the bytes of each user and make the data available for post-processing. read more
Every month, your carrier calculates how much data you've crunched through on your cell phone and charges you accordingly. But a new study suggests that they might not be adding things up quite right. read more