The Quickstart guides are intended to help you get started with Twilio. If you want to receive incoming calls to a phone number try starting with the Hello Monkey Quickstart. If you wish to initiate outgoing calls or get information about your account programmatically, try beginning with the Twilio REST API Quickstart. To start sending and receiving SMS messages with Twilio, check out the Twilio SMS Quickstart.
The Hello Monkey Quickstart provides an introduction to the Twilio Markup Language (TwiML). The demo walks though the process of building a system to handle incoming calls that greets callers by name, plays an audio file, connects the call to another phone number, and lets callers leave an audio recording.
The Twilio REST API Quickstart demonstrates how to build an application that initiates outgoing calls and gets a list of previous calls using the Twilio REST API.
The Twilio SMS Quickstart demonstrates how to build an application that sends and receives SMS messages, Twilio Markup Language (TwiML), or the Twilio REST API.