Twilio

Create a Twilio account (https://www.twilio.com/try-twilio)

Click ‘Get a Twilio phone number’

Copy Account SID to your .env file into the TWILIO_SID field

Copy Auth Token to your .env file into the TWILIO_TOKEN field

Copy your Twilio phone number to your .env file into the TWILIO_PHONE_NUMBER field

Add your own sender id to the .env file into the NEXT_PUBLIC_SENDER_ID field (fallback is Cal)

Create a messaging service (Develop -> Messaging -> Services)

Choose any name for the messaging service

Click 'Add Senders'

Choose phone number as sender type

Add the listed phone number

Leave all other fields as they are

Complete setup and click ‘View my new Messaging Service’

Copy Messaging Service SID to your .env file into the TWILIO_MESSAGING_SID field

Create a verify service

Copy Verify Service SID to your .env file into the TWILIO_VERIFY_SID field