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GSM modem and GSM codes

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TrevorWhite

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Hi all.

I have been messing around with a couple of GSM modems. One is a Telit and the other a SIM300.

With a Vodafone sim I can enter the command:

AT+CUSD=1,"*#103#"

and I get the network time back. But with t-mobile, virgin and orange sims installed I cant get this command to work. It just sends back:

CUSD: 4

So, my question is how come I cant sent such commands with the other networks. All i really want to do is get the time. I thought such codes were universal?

Thanks

Trev
 

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