![]() ![]() 3GPP TS 27.007 section 7.3 AT+COPS), and choose the network that you want for the SMS. In this case, you would have to find all the available networks via AT commands (e.g. ![]() But you generally get more choice when you're roaming. Operators don't usually allow you to select another operator when you're using a SIM in its home country - you have to stay on the home network. Use a roaming SIM, that is to say a SIM from another country. ![]() Look for multiple commercial SMS gateways that each send SMSs to a different operator (Note that using a commercial SMS gateway is the only realistic option if you're planning to send large numbers of SMSs). Look for a commercial SMS gateway that can send to different operators - I don't know if any of them offer that service. Have multiple GSM devices, each with its own SIM slot containing a SIM from a different operator (this is probably your best option if you're not planning to send a lot of SMSs). This is not a technical thing, it depends upon agreements between operators. Look for a single SIM that supports multiple operators - not available as far as I know. ![]()
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