Spectrum

Frequency

Benefit

3G

(We’re phasing out our 3G network and will switch it off completely by the end of 2024.)

High Band: 2100MHz

OK speeds within the 3G bandwidth

4G

High Band: 1800MHz & 2100MHz

Standard good speeds within the 4G bandwidth

​(faster than 3G)

4G+

Low Band: 800MHz

High Band: 1800MHz & 2100MHz

Combines multiple bands of 4G frequency to improve speeds

(supported on most 4G enabled devices)

VoLTE

Low Band: 800MHz

High Band: 1800MHz & 2100MHz

Similar to 4G+ but customers can only use VoLTE if they have a compatible device

​(https://help.smarty.co.uk/en/articles/4237414-which-devices-are-compatible-with-wifi-calling)

L-Band
​(Previously called Super 4G+ or 4G++)

Currently being rolled out

Low Band: 800MHz

Mid Band: 1400MHz

High Bands: 1800MHz & 2100MHz

Extra improved speeds up to 130% in congested areas

(customers must have an L-Band compatible 4G device)