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Cheapest SIM card for US-based extremely low volume SMS only?

I am making an IoT device which has a GSM interface, to receive and send SMS messages. I am using SMS messages to reset the device (which normally operates over WiFi, but the SMS is an emergency reset). So I need a SIM card with the lowest monthly cost of ownership based on maybe 1 SMS message sent/received per month.

I'm OK with putting money up front into an account/pool that is used when SMS messages are sent. I would like to minimize / avoid any monthly fees or minimums.

What is my best bet for a US-compatible SIM card with these characteristics?

submitted by /u/stevenc88
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