Spectrum used in most modernised commercial deployments by mobile network operators in the United Kingdom. Downlink spectrum shown except in the case of TDD.
800MHz (Band 20) FDD
All four mobile network operators have spectrum in the 800MHz band: Three with 5MHz paired at EARFCN 6175, EE 5MHz paired EARFCN 6225, Vodafone 10MHz paired EARFCN 6300, O2 10MHz paired EARFCN 6400.
900MHz (Band 8) FDD
900MHz spectrum is only possessed by Vodafone and O2 and is used for their 2G and 3G services. In the most modernised areas, both operate two carriers of 3G: Vodafone at UARFCN 2938 as the primary and 2987 as secondary. In the case of O2, it is 2963 and 3012 respectively. The rest of the spectrum is used for GSM. On some sites in multiple vendor regions, Vodafone and O2 have been seen sharing 2938, 2963 and 2987, which enables Dual Carrier 3G operation from a single site as 2938 and 2963, 2963 and 2987 are contiguous where the operators' native carriers are not.
1500MHz (Band 32) Supplementary Downlink
This spectrum is downlink only and therefore must be paired with another band, such as Band 20, for uplink. Vodafone and 3 both have 20MHz with EARFCNs 10020 and 10220 respectively. 3 has this spectrum deployed on multiple sites in Oxford, while Vodafone has it on on their Atlas and Smale offices.
1800MHz (Band 3) FDD
EE is the big holder of 1800MHz spectrum with 45MHz paired, used for up to two LTE carriers: EARFCN 1667 at 20MHz and EARFCN 1811 at 10MHz, alongside GSM. Three is the next largest at 15MHz paired, EARFCN 1392, meanwhile Vodafone and O2 each have 5.8MHz paired. Vodafone uses EARFCNs 1288, while O2 uses a few: 1226 for Macro sites generally and 1228 for microcells and small cells but 1229 and 1230 have also been seen. While EE and 3 use 1800MHz as a core 4G layer, O2, and especially Vodafone, have it deployed solely in high load locations as a capacity add.
2100MHz (Band 1) FDD
Originally used for 3G services, the 2100MHz band is rapidly being refarmed in the UK for 4G services. Vodafone was the first to commence refarming, initially of 5MHz (one 3G carrier cleared out of the three), but now the entire allocation is done in many locations, producing EARFCN 323. O2 was next, again initially refarming one of the 3G carriers' spectrum, though currently full refarm producing EARFCN 199 is present in many cities (albeit predominantly O2 hosted zones). Third was three who immediately refarmed two out of the three 3G carriers on the sites for EARFCN 99. EE was the last provider to start refarming 2100MHz, likely due to their extensive existing 4G bandwidth through the 1800MHz and 2600MHz bands. EE refarms half of the 2100MHz to have EARFCN 547 and two 3G carriers.
2300MHz (Band 40) TDD
O2 owns all of the allocated spectrum in this band and currently uses 20MHz of it for EARFCN 39250 which is deployed with 4T4R
2600MHz (Band 7 [FDD] and Band 38 [TDD])
Vodafone and EE are sole owners of this spectrum. Vodafone deploys 20MHz of TDD, predominantly with Massive MIMO, EARFCN 37900. They also have 20MHz paired FDD of EARFCN 2850, which is used as a widespread urban capacity add, usually with 4T4R on busy sites. EE, through BT, owns 50MHz of FDD 2600MHz and 25MHz in TDD but only 35MHz of the FDD is used. This provides two carriers: EARFCN 3350 is the primary carrier of 20MHz and 3179 is the secondary at 15MHz. Both are deployed commonly as an urban capacity add.
3500MHz (Band 42) TDD
While all the mobile network operators have spectrum allocated in this band, only UKBB/Relish/3 have it commercially deployed for fixed wireless broadband in London and some other locations. Two carriers: 41490 and 43490.
3600MHz (Band 43) TDD
UKBB/Relish/3 operate four carriers on this band.