Explanation: The Iridium satellite system utilizes specific frequencies within the L-band for its global telephone and messaging services. This band is internationally allocated for Mobile Satellite Service (MSS). The frequency range of 1616 - 1626 MHz is specifically designated and licensed for the Iridium constellation's uplinks from user terminals to the satellites. The other options represent different parts of the radio spectrum used for various other services: * A) 965 - 985 MHz is within the 900 MHz band, often used for terrestrial mobile communications or other licensed services. * C) 1855 - 1895 MHz is part of the 1.8 GHz band, commonly allocated for cellular networks (e.g., PCS). * D) 2415 - 2435 MHz falls within the 2.4 GHz ISM band, widely used for Wi-Fi, Bluetooth, and amateur radio operations.