Which of the following can be done using an amateur radio satellite?

Amateur radio satellites are primarily designed to facilitate communication between operators around the world, allowing ham radio enthusiasts to talk to one another regardless of geographic boundaries. This capability is fundamental to the function of amateur radio satellites, enabling operators to establish contacts that they might not be able to achieve through terrestrial means due to distance and obstacles.

While obtaining global positioning information and making telephone calls may seem plausible, those functions are typically not the primary purpose of amateur radio satellites. Getting global positioning information is generally associated with GPS technology rather than being a core feature of what amateur satellites provide. Similarly, making telephone calls is not a function supported by these satellites, as they are focused on amateur radio communication rather than commercial telephony.

Therefore, the best choice reflects the primary and intended use of amateur radio satellites, which is to enable communication among amateur radio operators globally.