quadband

Quadband is a term used in mobile communications to describe radio equipment that can operate on four distinct frequency bands, facilitating use on multiple networks and in different regions without a market-specific device. The phrase most often refers to quad-band GSM devices that support the four 2G frequency bands: 850 MHz, 900 MHz, 1800 MHz, and 1900 MHz. This band set allows roaming across many countries and service providers that still rely on GSM 2G networks, particularly in Europe, Asia, Africa, and the Americas.

In practice, manufacturers may market devices as quadband that also support additional bands for 3G or 4G/LTE, but in most contexts quadband denotes coverage of those four GSM bands. When evaluating a quadband device, consumers should verify that the specific model supports the required frequency bands and network technologies for their region and for roaming.

Benefits of a quadband device include improved roaming capability and reduced need for multiple region-specific handsets. Limitations include the possible absence of newer LTE or 5G bands on older quadband models and the need for correct SIM compatibility and carrier approval.