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Instead of Twilio you could use SNS and subscribe to it via SMS. You would most likely stay within the free tier there too.

• doctorray 5y ago
  I just added this in. Not super elegant but can publish to a topic with the notifications, then up to the user how they want to receive them.
  • aweiland 5y ago
    Cool. Probably not as elegant as Twilio, but free is hard to beat.