NOT SUPPORTED OR MAINTAINED BY TWILIO, USE AT YOUR OWN RISK.
Twilio lookup allows you to determine if a phone number is a mobile number or a landline. This project allows you to upload a CSV, run a bulk lookup, and then download a CSV with information from the Lookup API.
Before you start, you'll need the following:
$ heroku run rails console > AdminUser.create(email: 'firstname.lastname@example.org', password: 'your_pass', password_confirmation: 'your_pass')
Visit your heroku application and log in using the credentials you entered above.
Wait for your lookup to process. It will take rougly 1 hour to process 4,000 contacts.