We have vetted these numbers and don’t expect you’ll have problems should you choose to purchase and try one out, but you should be aware that occasionally this testing phase reveals issues that we cannot detect in our test labs. Please keep this in mind as you deploy these numbers as part of your application. It is not advisable to use these for critical path or production systems until we have more experience with the numbers and are able to put them into Beta. Please also note that on rare occasions some numbers don’t successfully pass the preview stage and need to be discontinued from service. Should any issues arise, you can expect the same level of support and responsiveness that you’ve come to expect from Twilio.
You can find details on pricing and characteristics of the available numbers here: https://support.twilio.com/hc/en-us/articles/230434707
Please note that all of the Toll Free numbers in Developer Preview are designed to be used for domestic inbound voice calls.
To request a number to be assigned to your Twilio account, please complete and submit this form.