Send arbitrary commands to modem for info

Posted by mydoghasworms on Ask Ubuntu See other posts from Ask Ubuntu or by mydoghasworms
Published on 2012-03-23T09:50:09Z Indexed on 2012/03/24 5:39 UTC
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Filed under:

networking

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3g

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pppoe

I have a USB 3G data card and modem. According to the supplier, to check the data balance on the account, I must dial a number like *89# (or whatever) from the handset.

The device appears as a ppp0 interface in my network devices.

How does one go about issuing commands to the modem to send the commands and receive back the information?

UPDATE: OK, I found some help here: http://www.linuxquestions.org/questions/linux-hardware-18/sending-at-commands-to-a-sms-modem-372445/, but firstly, there are 3 ttyUSB devices on my system, and I assume that one of them is the 3G modem, but how can I tell? Secondly, trying to echo something to two of them says that the device is busy, which stands to reason, because I am using it to connect to the internet.

Some help, please?

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