Sub-6

5G technologies are not limited to millimeter wave (mmWave) spectrum. Carriers can also deploy 5G onto lower frequency cellular bands that have greater range, but slower speeds.

The term "Sub -6" or "low band" has become shorthand for the "lower than 6GHz" cellular bands, to distinguish them from the very high mmWave 5G spectrum that broadcasts at 24GHz or higher.

All 4G/LTE bands are technically "sub-6", though this label is primarily used when discussing 5G technology.