All newly purchased Twilio numbers will respond to incoming SMS and MMS messages with a default sample message response. We recommend that you configure phone numbers as soon as possible.
Configure a Phone Number to use a Twilio Application
Twilio phone numbers can be configured via the Console site, or the REST API. Full instructions can be found in our article Configuring phone numbers to receive calls or SMS messages.
Configure a Phone Number to Receive Incoming Messages without Responding
The default phone number behavior is to automatically reply to incoming messages. For instructions on configuring your phone number to receive messages without an auto-response, please see our article Receive SMS and MMS Messages without Responding.
Which Configuration Should I use?
The Twilio configuration you pick will vary depending on your use case and business needs. For more information on how Twilio Programmable Messaging works, please see these resources:
If you have additional questions, please feel free to reach out to Twilio Support.