It’s also used to offer cheap sms service to shady aggregators or mobile network operators. These phones will have a free sms subscription and they send incoming otp SMS s through to end users for say half the normal price of an otp SMS. 100% profit.

Interesting though as you say, also shady. Also seems marginal. Sending enough SMS to recover the monthly cost of the SIM cards seems likely to get the carriers’ attention after a while. Outbound SMS from Twilio are around 0.8 cents each in the US fwiw. Much less hassle. Maybe even less from carriers. No idea about EU.

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