Global System for Mobile Communications (GSM: originally Groupe Special Mobile) is a mobile technology and the most popular standard for mobile phones in the world.

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How do I add support for a yet-unsupported WWAN device to OS X?

The big goal of mine is to make my OS X machine support my Huawei E1550 dongle without installing any 3rd party driver. The fact is, that AppleWWANSupport*.kext and the whole WWAN infrastructure is ...
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Convert GSM audio file to G.729

How can I convert GSM sound files to G.729 format? I've used Sox in the past for transcoding sound files, but have not been able to find a way to transcode to G.729. Using Sox, I have found a way to ...
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Sim error in GSM modem

I have a Cinterion modem with a T-Mobile sim card. I am unable to send an SMS message with it. Here are some of the commands I ran in the modem: AT+CMEE=2 AT+CPIN? +CPIN: READY OK AT+CSQ +CSQ: ...