For which purpose is low-band spectrum primarily used?

Low-band spectrum is primarily utilized for long-distance voice calls due to its ability to travel further distances and penetrate through obstacles such as buildings and terrain. This characteristic allows low-band frequencies to maintain signal integrity over greater areas, making them suitable for traditional telecommunication services.

In contrast, high-band spectrum typically supports high-capacity data transmission, requiring shorter ranges and more advanced infrastructure, while short-range wireless applications typically use mid-band and high-band frequencies. Low-speed internet browsing is generally associated with even higher frequencies due to their capabilities, which focus on data transmission rather than voice communication. Therefore, the most appropriate purpose for low-band spectrum is facilitating long-distance voice calls.