How to import an SMS (Twilio) account?
Missive needs your Twilio SID and Auth Token, plus your phone number. Both SID and Auth Token should be available in your Twilio console page. Look for them on the right side of your screen.
Still from the console, you can access your Phone Numbers by the “three dots” button in the sidebar. It should be under the Super Network category. Here’s the link in case you can’t find it. From there, you should have the option to buy a number. Once bought, that is the full number you will need to enter back on Missive. Don’t forget to enter the country code as well (your number should start with a plus + sign).