A method and apparatus for providing closed user group service in a packet radio system, which includes at least one network and at least one group including a plurality of subscribers. The closed user group access conditions for at least one subscriber are determined in the network, the access conditions include at least one of the following conditions: right to communicate with parties outside the group, and right to communicate with at least one member of the group without communicating with all members of the group. The access conditions are checked when packets are being sent to/from the subscriber. The packets are transferred if the access conditions allow the transmission.