The UniFi UI exposes no SMS interface for the U5G's built-in 5G modem. This documents how SMS send/receive actually works under the hood, accessed over SSH.
The U5G uses a Qualcomm MSM integrated modem. Communication happens over:
- QRTR (Qualcomm IPC Router) — modem is at node
qrtr://3 - SMD (Shared Memory Driver) — AT command port at
/dev/smd7