A mobile communication terminal is provided that is capable of shooting a code image, restoring data from the code image, and using the shot code image and the restored data, in response to a request from an application program. The pressure pulse generator comprises a first pair and a second pair of electrically controlled valves that are connected in series, and the first pair of valves is arranged in said circuit upstream the at least one communication channel, and the second pair of valves is arranged in said circuit downstream the at least one communication channel. After sending the activationmodification request message from SGSN to user equipment, an IP session with PDP context encryption between the UE and a destination is initiated according to the security information element.