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spent already 3 months on testing Huawei cellular modems for USSD support.
E160 - no USSD support at all
E169 - having contacted my Telecom 10 times and asking Huawei for help,
USSD service started to work temporary in limited mode
I can send express code for balance check and it started to work this week,
as crashed in previous week.
Tried to recharge my prepaid account and I can send recharge code from MTMA and get 2 messages
Thanks, we received your request.
setting binary mode
trying to send anything from MDMA as USSD, like balance check
I get error message
USSD send failed.
So USSD session is terminated finally and I have to reset a modem
turning it off and inserting it back into notebook to work.
To my surprise, after 20 minutes, the problem with sending USSD codes
has been solved on itself and I could send balance check code
and get right response.
Any idea ginggs ?
Mayby I should send one more USSD command after recharge code, appended, to have it reset modem into ASCII transmission immediately,
to keep USSD session live , active and open afterwards.
Any help ?
Please tell me how it works with other models by Huawei or by other manufacturers.