[patrickmalatack]

All messages from twilio MUST originate from a real phone number that you have purchased from twilio.

If you do not wish to receive replies you can clear the URL associated with your number.

[dazbradbury]

Thanks for the clarification.

Just to confirm (as it's a real number), if a user sends an SMS to that number, but no URL is associated with it, will I be charged? I would assume not, but worth checking!

[dmor]

Nope, you won't be charged if you remove the URL associated with that number