There is provided a gas turbine capable of improving the durability of a main shaft by absorbing the deformation of a casing due to heat and pressure and suppressing stresses acting on the main shaft. In additional aspects, the Ear Interface portion of these devices permits the user to adjust the transmission of ambient sound. The interchangeable connectors each have standard connector for connection with computers and other device that are compatible with the flash memory. Recording of a disconnection voicemail message for the disconnected first communication device is enabled before disconnecting the second communication device. 01, and comprises a primary molding and injected resin injected within the primary molding for bulging said primary molding into the shape of said barrel shaped cavity that has a largest diameter at the parting line by the injection pressure. The method further includes authorizing control and access to the at least one multimedia source, providing a control channel from the mobile service platform to at least one multimedia server, providing multimedia data delivery information to the at least one multimedia server, and providing multimedia data to the mobile device in response to the request via the at least one multimedia server.