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Intelecommunications, amulti-band device (including (2)dual-band, (3)tri-band, (4)quad-band and (5)penta-band devices) is a communication device (especially amobile phone) that supports multipleradio 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 supportroaming 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.^{[citation needed]}

The termquad-band describes a device that supports four frequency bands: the 850 and 1900 MHz bands, which are used in the Americas, and 900 / 1800, which are used in most other parts of the world.^[1] MostGSM/UMTS phones support all four bands, while mostCDMA2000/1xRTT phones (mostly North America and voice transmission only) do not, and so are considered onlydual-band devices. A few phones support both of the domestic frequencies but only one foreign one for limitedroaming, making themtri-band phones.^{[citation needed]}

The termpenta-band describes a device that supports a fifth frequency band, commonly the 1700/2100 MHz band in much of the world. TheAdvanced Wireless Services (AWS) 1700 MHz band is also seeing increased usage.^{[citation needed]}

This section needs to beupdated. Please help update this article to reflect recent events or newly available information.(January 2022)

In theUnited States only, the two largest carriers are instead implementing 4G LTE in the 700 MHz band, which was reallocated fromTV broadcasting during theDTV transition.TV stations were forced to move to lowerUHF and even far worseVHF frequencies with poorermobile TV and even regularterrestrial TV performance^{[citation needed]}, because the 700 MHz band has betterradio propagation characteristics that allowmobile phone signal to penetrate deeper into buildings with lessattenuation than the 1700 MHz or 2100 MHz bands.^{[citation needed]}

AT&T Mobility devices use formerTV channel 53 and 54 nationwide and has purchased spectrum from former TV channel 55 nationwide (purchased fromQualcomm's defunctMediaFLOpay TV service), and also channel 56 in densely populated areas such asCalifornia and theNortheast Corridor.Verizon Wireless formerly held frequencies just above TV channel 51, which is still in use, causingadjacent-channel interference that is preventing the carrier from using them until the planned top-downspectrum repacking occurs. The channel 52 spectrum was later purchased byT-Mobile US who now uses this spectrum for their network. Verizon now uses higher blocks within the former TV band (channels 60 and 61).^{[citation needed]}

• 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

• GSM standard
• Mobile technology

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