how to send inter-operator sms via GSM/LTE module
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
So does anybody know how to send an inter-operator sms?
I would really appreciate it if anyone could help.
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.
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