If you use a GSM modem with SIM card to send SMS messages, you have to conform to the terms of the mobile operator. The terms usually include a section to prevent spam or excessive texting.
The only way to make sure that the SIM card will not be blocked is to conform to the terms of the mobile operator. For specific applications, you can also try to contact the mobile operator to get a SIM card without these limitations.
I hope this is the correct forum.
Just purchased an SMS gateway device.
I am wondering where people are getting the sim card for these servers.
I was using tmobile prepaid sims with unlimited text , but they got turned off for sending to many (10K month)
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