Thanks for the info! Super useful. I came across this Twilio support article: https://support.twilio.com/hc/en-us/articles/223181668-Can-Twilio-numbers-receive

Thanks for the info! Super useful. I came across this Twilio support article: https://support.twilio.com/hc/en-us/articles/223181668-Can-Twilio-numbers-receive-SMS-from-a-short-code- https://support.twilio.com/hc/en-us/articles/223181668-Can-T... Looks like you need to get the feature enabled, so you can receive SMS from shortcodes. You also need a number in the same country as the shortcode, so users of the service would need to indicate which country the number is for. This would most likely be fine, as I think most people only use 1 number in 1 country anyway. Hopefully this would solve (1) Twilio allows you to register mobile numbers, so I think (2) would be ok. 3. I'm not intending to use any hardware, so I think I could disregard this limitation, although it's useful to know anyway!