3GPP Band 5, referred to as the CLR (Cellular Low Band) in some regions, is a key 3G UMTS frequency band, especially prevalent in the Caribbean, Asia-Pacific, and Australia. This band operates as a Frequency Division Duplex (FDD) system, enabling two-way communication; it transmits from cell towers to mobile devices on frequencies 869 to 894 MHz, and receives from mobile devices on frequencies 824 to 849 MHz.
The widespread adoption of Band 5 (850 MHz) can be attributed to its early allocation for cellular services, particularly in Australia where it was known as "Next-G". As a lower frequency band, it offers extensive coverage and superior building penetration. The typical coverage radius can extend up to 30 kilometres in rural areas, and was known to reach beyond 60 kilometres in remote outback areas. The furtherest known usage was about 160 kilometres which was achieved while flying in a light aircraft in Northern Australia.
Band 5's lower frequency range is highly beneficial for vast area coverage and deep indoor penetration, making it particularly valuable in rural and suburban regions. Its wide coverage reduces the number of cell towers required, making it a cost-effective option for network operators.