The 3G USB modem I'm using creates /dev/ttyUSB which I can send AT commands to it as a serial port. But is there another API to communicate to a USB Modem? is it always working as a serial COM? How to get the API like AT command list from different vendors? I'm writing a program in C to make calls, data test and so on but the AT commands doesn't always work, many times I needed to unplug/plug the modem to get it to work again so I thought there could be another way to do that. Debian Linux is the platform by the way. Appreciate your answers.
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