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Just a heads up to anyone thinking of doing this in prod.

We had a USB connected 3G dongle as SMS modem for years, every other month someone had to head over to the DC and re-seat the thing. Because it just stopped working. I don't think they're designed to be connected 24/7.

We eventually switched to an Ethernet connected SMS modem. Much more reliable, and it was actually made for production, had a longer antenna you could fix on top of a rack cabinet.

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Can you point me to some brand who sell those?

Not that one, it was many years ago and I have moved on from that department since.

But it was also purchased in Sweden, from a Swedish retailer, so not sure what good this would do you.

A quick google gives me Induo [1] who make industrial 3G modems, with serial connection among others.

1. https://www.induo.com/produkt/modem/3g-modem/

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