||The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject. (September 2013)|
In telecommunications, a multi-band device (including dual-band, tri-band, quad-band and penta-band devices) is a communication device (especially a mobile phone) that supports multiple radio frequency bands. All devices which have more than one channel use multiple frequencies; a band however is a group of frequencies containing many channels. Multiple bands in mobile devices support roaming between different regions where different standards are used for mobile telephone services. Where the bands are widely separated in frequency, parallel transmit and receive signal path circuits must be provided, which increases the cost, complexity and power demand of multi-band devices.
The term quad-band describes a device that supports four frequency bands: 850 and 1900 MHz, mostly used in the Americas (ITU region 2), and the 900 and 1800 MHz bands used elsewhere. Most GSM/UMTS phones support all four bands, while most CDMA/1xRTT phones do not, and so are considered only dual-band devices. A few phones support both of the domestic frequencies but only one foreign one for limited roaming, making them tri-band phones.
The term penta-band describes a device that supports a fifth frequency band, commonly the 2100 MHz band in much of the world. The Advanced Wireless Services (AWS) 1700 MHz band also seeing increased usage.
4G LTE bands
In the United States only, the two largest carriers are instead implementing 4G LTE in the 700 MHz band, which was reallocated from TV broadcasting during the DTV transition. TV stations were forced to move to lower UHF and even much worse VHF frequencies with poorer mobile TV and even regular terrestrial TV performance, because the 700 MHz band has better radio propagation characteristics that allow mobile phone signal to penetrate deeper into buildings with less attenuation than the 1700 MHz or 2100 MHz bands.
AT&T Mobility devices use former TV channel 55 nationwide (purchased from Qualcomm's defunct MediaFLO pay TV service), and also channel 56 in densely populated areas such as California and the Northeast Corridor. Verizon Wireless holds frequencies just above TV channel 51, which is still in use, causing adjacent-channel interference that is preventing the carrier from using them until the planned top-down spectrum repacking occurs. It more recently acquired higher blocks within the former TV band, which it plans to use first.
Because of this uncoordinated frequency allocation internationally, and uncontrolled usage of frequencies allowed by the U.S. Congress and the Federal Communications Commission caused by considering only the revenue produced by spectrum auctions, even multi-band phones cannot be used on other 4G LTE networks. This limits the free market, and effectively makes cellphone unlocking a moot point, with the major carriers ensuring their phones cannot be taken to competitors by design, rather than by a simple unlock code.
The anti-competitive situation may eventually be resolved with the recovery of the original frequencies, after the shutdown of 2G and eventually 3G services. In this case, multi-band phones would presumably be able to find at least one or two bands no matter what mobile network operator's service is available in a given area.
- List of UMTS networks around the world, and the frequencies and data rates they support
- GSM frequency bands, as defined by the standards bodies
- UMTS frequency bands, as defined by the standards bodies