Is transport-related data (overhead data) also deducted? Is both uplink and downlink data deducted?

The included data volume is measured and deducted with an accuracy of 1 kByte. Both overhead data resulting from the use of the respective protocols, such as UDP or TCP, and the actual payload are included in our calculations. All transport data between the device/modem and applications is deducted. This includes both uplink and downlink data packages.