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I am using a GSM/LTE module (EC21 Quectel) to send and recieve sms with HyperTerminal application on computer by at-commands.

I can send sms to devices with the same operator (intra-operator), but not to any other operator (inter-operator).

I can even recieve sms from other operators on my module, but when i try sending to them i get error:

the first number has the same operator as my module's simcard and the second one has a different operator the first number has the same operator as my module's simcard and the second one has a different operator

So does anybody know how to send an inter-operator sms?

I would really appreciate it if anyone could help.

JustBaron
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Ali Sam
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1 Answers1

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Turns out the problem was because of my simcard monetary charge. for sending sms to diffrent operator, the network would charge me and my sim balance was zero. so i would get this "unknown error". so i charged my sim balance and the problem solved.

Ali Sam
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