Props for diving into this niche. It’s a grind, but if you nail the supply chain, you’re golden. But you can’t just buy 10k SIMs off Amazon without carriers flagging you for bulk activity. For starters, check out virtual number APIs like https://www.twilio.com/ or https://www.textnow.com/, they’re easier to automate than physical SIMs, but most block SMS verification codes. You’ll need to hunt down providers that don’t blacklist OTPs.
For physical SIMs, you’ll need a supplier in a country with lax SIM registration laws (think SE Asia or Africa). Sites like https://www.alibaba.com/ list wholesalers, but negotiate hard, they often overcharge. Alternatively, partner with local “SIM farms”. I’d hit up https://www.blackhatworld.com/forums/#the-marketplace.143/ for contacts, some sellers specialize in SMS verification infrastructure.
Tech-wise, you’ll need a custom script to auto-forward SMS. If you’re a dev, Python + Flask/Django can handle the backend, and use https://www.rabbitmq.com/ for task queues. For scaling, https://aws.amazon.com/lambda/ is clutch.
About monetization, subscription models work well. (use https://bitpay.com/ for crypto). The real juice is in number rotation to avoid detection. Use multiple carriers and cycle numbers every few verifications and never skip geo-targeting! Users pay premium for US/EU numbers.
One last thing: Legality. Cover your ass with airtight terms of service and a bulletproof VPN setup. Seen too many sites get nuked by Twilio bans or lawsuits.
Good luck, : )
