An example of a serverless function that sends an SMS message using Twilio (deployable to Netlify Functions).

serverless-function-send-sms.js

const accountSid = process.env.TWILIO_ACCOUNT_SID;
const authToken = process.env.TWILIO_AUTH_TOKEN;
const client = require('twilio')(accountSid, authToken);

exports.handler = async () => {
  const response = await client.messages.create({
    // RIP Mitch Hedberg
    body: 'Is a hippopotamus a hippopotamus... or a really cool opotamus?',
    from: '+15552888588',
    to: '+15558675309',
  });

  return {
    statusCode: 200,
    body: JSON.stringify(response),
  };
};