gsm - AT COMMANDS - USSD returns only OK -

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i have bought zte mf667 gsm modem , using hyper terminal send @ commands, have problem ussd e.g :

at+cusd=1,"*111#",15 (to check balance) returns ok  at+cusd=1,"*111#" returns ok

i have tested @ commads work fine like

at+cmgl="all" read sms (works)

how resolve problem please ?

first of ussd messages similar sms in message sent mobile device operator network. means when execute ussd command on mobile device not receive immediate response operator network's ussd service must answer message. explains why receive "ok" answer ussd command. "ok" telling ussd command syntax valid , ussd command sent mobile device operator network, nothing more.

secondly ussd command responses returned unsolicited response , therefore not stored alongside sms's.

quote wikipedia regarding this:

ussd associated real-time or instant messaging services. there no store-and-forward capability, typical of other short-message protocols sms.

addressing concretely problem either assume operator network being incredibly slow in responding. or alternatively "get balance" command sending incorrect operator network. recommend checking operator networks website check "get balance" ussd command code.


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