Yes. Toll-free phone numbers in the US and Canada are enabled to send and receive text messages domestically within the two countries. To receive text messages on your toll-free phone number, you will need to configure your SMS request URL.
Please note that standard messaging rates do apply when sending SMS to, and receiving SMS from, a toll-free number.
Toll-free phone numbers in the United Kingdom are not able to send or receive text messages.
We do not recommend using toll free numbers internationally, as some countries may not accept the sender ID and hence result in message nondelivery. Please use a US or Canadian local number to send international messages instead.
When making an SMS app with Twilio, you must use an SMS enabled phone number. Please refer to this list of SMS enabled phone numbers.