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I used a 3G(WCDMA) mobile data modern, which dail up in embedded linux, sometimes I find the USIM card is out of balance, so it can't dialup normal, I just search the modern manual to find the AT command can be help.

I use command called "SYSINFO", but it doesn't work. whether or not it have a method to judge the USIM status which is out of ballanace.

hlovdal
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xtank
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1 Answers1

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You will need to dial a USSD command. This is different for each operator.

For example, on Vodafone UK it's *#1345# - on other networks it can be *100#

Depending on your modem, you will need to send

AT+CUSD=1,"*100#",15

or

AT+CUSD=1,"*100#"
Terence Eden
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