Ok. I spent a lot of research doing this. You can use unlimited text plans and do quite well. Certain carriers will block you quicker than others. As long as

Ok. I spent a lot of research doing this. You can use unlimited text plans and do quite well. Certain carriers will block you quicker than others. As long as you are sending out SMS with a link so you can monitor the click rate - then you can disable that device from sending. If you disable that device for a few hours the carriers will let you start sending again. There are carriers that do not require an id for pay as you go sim cards with cash. With android you can also read the messages to and even respond to STOPS or add response conversations. Verizon seemed to be the best. I was able to beat twilio for mass sms in pricing - but due to the carriers blocking a high percentage %10+ it isn't a good solution for 2fa etc. I have built apple labs too. Apple imessage used to allow quite a few messages before a block - but now they just block the entire device not the sim making it useless. I had the devices just use a get request to check a queue in mysql. my lab: https://i.imgur.com/gKknrJn.jpg https://i.imgur.com/gKknrJn.jpg