Twilio
- Twilio is on by default
- Twilio authenticates an end-user’s mobile phone number by texting a 6-digit code to the end-user’s mobile phone number
- In an effort to reduce bad actors and fraud, Under does not text Voice over Internet Protocol or landline numbers
What we send
- Phone number, type of phone, and number of attempts

What we receive
- Name of account owner, type of phone, country code, valid True/False
