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I have two or more 4G dongles connected via USB. I have set up multiple configuration files (one for each provider), but short of a visual inspection (which for this project won't be possible in the field) I have no way of knowing which SIM in which dongle is connected to which mobile provider.

Is there a way of interrogating the dongle from the command line - perhaps using the chat command - to ask it which mobile provider it is connected to? Obviously smartphones can do this - they display it, after all. Would this be possible with a dongle?

By the way, this would be before telling the modem to connect to the provider's APN, so I can then call pppd with the provider-appropriate config file.

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  • What operating system(s) are you using? – Jeff Schaller♦ Nov 11 '18 at 20:14
  • Linux, which is why I posted it here. :) – uvdevops Nov 11 '18 at 20:37
  • We have a variety of Unices here, so it helps to narrow it down. – Jeff Schaller♦ Nov 11 '18 at 20:47
  • And what dongle do you have? Most support AT commands (extended with a lot of custom stuff). In which case, go get its (possibly "confidential") manual. But I once had a 4G dongle that was running itself some version of linux+busybox and working as an actual router -- if presented itself as CDC device no different from an android phone in tethering mode. I could get into it by "exploiting" the php(!) scripts from its web configuration interface ;-) – mosvy Nov 11 '18 at 21:55
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I found the answer here. The command to send to the modem is AT+COPS?. The response will be something like 

+COPS: 0,0,”Verizon Wireless”,7
OK

I just need to write some scripting now to automate this.

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