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I'm bulding a program with AT Command to control my Gsm Modem.

My country have 2 operators (VIETTEL and VINAPHONE).

When i push SIM of VIETTEL to GSM Modem (on port COM21), I execute command AT+CUSD=1,"*101#",15

and then, i get result is +CUSD: 2,"STB: 84981057863. TK goc:0d. De biet cac CTKM khac, bam goi *098#.",1

But when i push other SIM of other Operator (VINAPHONE) to this Port (still on port COM21), I also execute same command. And then, i get result is

OK ERROR.

Please help me!!! Sorry because my english is bad.

This is my screen captured: https://anorise.work/SIM.png

Thank you!!!

J. Doe
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  • If it's the same modem you had been using for both tests, are you sure the second operator, Vinaphone, uses the same short code, `*101# ? – mszmurlo Mar 12 '19 at 06:21
  • @mszmurlo yes! im sure two operators uses the same code __*101#__ because i was test on phone and it's ok – J. Doe Mar 12 '19 at 09:08
  • still need answer? you can try ```AT+CUSD=1,"*101#"``` without "15" – Spidy Jun 14 '22 at 18:58

1 Answers1

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Try to look at ATD command.

And try ATD"*101#"; and ATD"*101#".

Luc vu tien
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