Tunable diodes and methods of making. By integrating a Fischer-Tropsch hydrocarbon production facility with an electrical power generating facility, peak-load power demand can be met by reducing the temperature of the FT reactor thereby increasing the quantity of tail gases and using FT tail gases to fuel a gas turbine generator set. The contact-sharing channel is used to fetch contact information of one or more of the second contacts, so as to display at least part of the fetched contact information in the client application and establish a communication based on at least part of the fetched contact information. The apparatus also includes a storage device storing machine-readable code and a processor executing the machine-readable code. The first data connection to the network by the first modem is terminated when the data call state of the second modem is no data call.