Credit - How can I check balance on my SIM card? (USSD commands usage)

Go to the Putty, HyperTerminal or other terminal supporting telnet protocol.

Connect to 2N® VoiceBlue Next IP on port 23 and fill login data.

Finally use these commands:

AT&gXX=xtdUSSD

or

AT&gXX=xtdUSSD; (semicolomn at the end is required by some GSM/UMTS modules)

XX is number of GSM module counting from 0
USSD is the operator code for getting of credit

Example:

USSD sequence *122# sent over second module:

at&g01=xtd*122#
<++g01 atd*122#
-->g01 OK
-->g01 +CUSD: 2,"YOUR CREDIT IS 22 EUR VALID UNTIL 18-12-2010.",15

Other GSM/UMTS module type:

at&g01=xtd*122#;
<++g01 atd*122#;
-->g01 OK
-->g01 +CUSD: 2,"YOUR CREDIT IS 22 EUR VALID UNTIL 18-12-2010.",15

If you receive CUSD 4 replz instead of a text reply, it usually means