It's hard to overstate how much easier the Twilio API has made it for developers to interact with SMS and phones.
When I first built StoryWorth, it only worked over email because I thought voice recording would be too complex (both to use and to implement).
However, users kept asking for it so I finally bit the bullet... and it was way easier than I expected. Using the Twilio API, I had voice recordings over the phone working within days.
The team is also super friendly. Less than a month after our launch, someone reached out to me and they wrote about our company on their blog:
https://www.twilio.com/blog/2013/05/old-stories-new-tech-sto...
Really glad to see their continued success!