SA

Standalone is 5G with no 4G crutch — NR radios talking straight to the 5G Core. That single change is what turns on the features NSA can't reach: end-to-end network slicing, native URLLC with its low-latency user plane, better device battery life (no need to maintain dual LTE+NR connectivity), and the whole service-based 5GC with functions like the AMF, SMF and UPF.

It's also harder to deploy, which is why most operators did NSA first. SA needs the new core stood up and integrated, and it needs continuous NR coverage — there's no LTE anchor to fall back on for control, so coverage holes hit harder. Once it's in place, though, SA is the foundation everything else builds on: slicing for enterprise customers, edge computing with a local UPF for low latency, and the migration path toward 5G-Advanced. When people talk about 5G "finally delivering on its promises," they almost always mean the move from NSA to SA.