Tech Insights: Network Scanning Without a SIM

Network Scanning via AT Commands

This functionality is based on standardized AT commands provided by the respective modem manufacturer:

• Telit modems use the command: AT#CSURV

• Quectel modems use the command: AT+QSCAN

These commands enable a detailed scan of available networks – even without a SIM card.

Scan Duration and Results

The time required for a network scan varies depending on the modem type and the supported radio technologies (2G, 3G, 4G, 5G). A full scan, independent of the mobile operator, typically returns:

• The best receivable cell per frequency band and provider

• The corresponding Cell ID and other technical parameters

Limitations & Benefits

A SIM-less network scan does not replace a full network registration. It cannot guarantee that the device would be allowed to attach to a detected cell, due to potential access restrictions or network prioritization settings.

Nevertheless, this method offers clear advantages:

• Overview of available providers, used technologies (e.g., LTE, NR), and active frequency bands

• Validation of modem and scan configurations