Twilio really is a great provider. Sure they're expensive, and sure you have to pay to lease your number every month, but I've had so much fun with them. For

Twilio really is a great provider. Sure they're expensive, and sure you have to pay to lease your number every month, but I've had so much fun with them. For example I hooked I setup a simple "on-call" system by monitoring a specific Slack channel, and when emergency-messages were present, would dial and play a message to an engineer. Wonderfully reliable and worked really well.