It&#x27;s arguably a lot easier to use Twilio for something like this because there&#x27;s no hardware needed and you can be up and running in about 5 minutes for a simple setup. That said, the real difference here is probably that Twilio allows you to buy a bunch of numbers cheap so you can scale SMS. Carriers sometimes filter out messages if they are sent too often by one number, so it helps to spread the load across several if you are talking to a lot of users (and services like Twilio handle rate-limiting for you).<p>This is really cool though, the second SMS hardware hack I&#x27;ve seen on here this week. Glad to see people playing more in this space (especially in theatre, my other passion).<p>Disclaimer: I work for Twilio