1. Log in to the ER605 WEB interface (192.168.2.1, username: adm/123456);

2. Navigate to [Network → Cellular Network Settings → Dial-up Configuration];

3. Select "SIM2" from the dropdown menu under "Preferred SIM Card";

4. Click "Save Application", and the device will disconnect SIM1 and automatically switch to SIM2 for dialing; 5. Navigate to [Status → Cellular Network Status] to view the connection status and signal parameters of SIM2.