Spam issues aside, I am curious why they are using Twilio, which is a (relatively) expensive proposition. Rather, I'd have the app send the messages directly f

Spam issues aside, I am curious why they are using Twilio, which is a (relatively) expensive proposition. Rather, I'd have the app send the messages directly from the user's number. The app could then upload all sent/received messages to the sever and have all of the same benefits. None of this would be a problem on Android. On iOS it's a little more tricky since SMS access is locked down, but incoming iOS SMS can be read indirectly by reading device notifications. So it could be done.