Deploying 5G SA is not just installing new base stations. It requires building out the 5G Core (5GC) – AMF, SMF, UPF, PCF, UDM – integrating it with the IMS for VoNR, and deploying gNB (5G NR base stations) that connect to the 5GC rather than the existing EPC. For operators who have invested billions in 4G EPC infrastructure, this is a significant programme.
The 5G SA rollout in the UK is happening in stages: first enterprise and industrial private network deployments, then public macro network coverage in cities and transport corridors, then broad consumer VoNR availability.
| Operator | 5G SA status | VoNR status | Notes |
|---|---|---|---|
| EE (BT Group) | 5G SA deployed in select areas | Enterprise/limited consumer | BT Group has strong 5GC investment. Urban deployment focus. |
| Vodafone | 5G SA in trials and early commercial | Enterprise focus | SuperCell tower sharing with Three accelerates some coverage. |
| O2 (VMO2) | 5G SA announced and deploying | Limited – expanding | CTIL infrastructure shared with Vodafone. |
| Three UK | 5G SA core deployed | Enabled where 5G SA available | Three’s spectrum portfolio (3.5 GHz, 3.8 GHz) suits 5G SA dense urban. |
This is the most common source of confusion. A 5G phone showing “5G” in the status bar in the UK is almost certainly using 5G NSA for data, and therefore using VoLTE for voice calls. True VoNR only activates when:
Without all four conditions being met, the phone falls back to VoLTE for voice regardless of what the signal indicator shows.
The first meaningful VoNR deployments in the UK are in enterprise and industrial settings, where operators offer dedicated 5G SA network slices. A private 5G SA network for a manufacturing site, hospital, or transport hub can provide VoNR on a dedicated slice with guaranteed QoS – delivering the audio quality and latency guarantees that public network voice cannot always deliver in dense environments.