Ask HN: When using Twilio, how do I tell if my SMSes are being carrier filtered?
My startup sends SMSes through Twilio. I know from https://support.twilio.com/hc/en-us/articles/223181708-Can-my-Twilio-SMS-Messages-be-Blacklisted-as-Spam- that, if a phone carrier filters my message, I won't necessarily get an error code from Twilio.
In practice, how do you tell if you're being carrier filtered? What circumstances have you observed it happening in? What is a safe line to stay within? Have you tried using https://support.twilio.com/hc/en-us/requests/new If not, please use that. Hacker News is not really the place for Product Support. I'm looking for what people's real experiences are. Twilio provides guidelines around this, but they are very conservative and speculative. If this isn't the place, though, I understand.