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It routes the SMS trough the GSM modem (containing a sim card), mimicking a dumb phone.

I wonder how many messages you can send before your carrier gets annoyed (or auto-anti-spam protection kicks in). This is a cool project - well done!

Why would they get annoyed? They're being paid per SMS, aren't they?

I do not know if telcos in other countries also have this but here in the Philippines, there are promotions where you can use a prepaid SIM and pay a fixed amount per day/week/month which allows you to send unlimited SMS.

While this is beneficial to consumers, SMS spammers equipped with gsm modems and this promowls to send text blasts. Prepaid SIM cards are also not regulated here (no need for ids to buy one) and you can get one for about $1.

Ahh, I see how there is a potential for abuse in those cases. Here in Fiji, you'd pay for every SMS sent, and (since around 2010) prepaid SIM cards require registration with ID at point of purchase.

At least in France, they limit the numbers of different correspondents you can text in a single month. It's usually around 200 if you read the fine print.

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