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What happens when I attempt to send messages to a landline?

Currently the behavior is dependent on the location of the recipient.

When sending a message to a landline number in the US, Canada and the UK:

Twilio will not check whether the number is a landline and will attempt to send it to our carrier for delivery. Some carriers (especially the ones in the UK) will convert the SMS into text-to-speech messages via voice calls.

When sending a message to a landline number in other countries:

The Twilio REST API will throw the error below. A message record will be created in your Messaging Logs and Insights.

"code": 21614, "message": "To number: +86XXXXXXX, is not a mobile number", "more_info": "https://www.twilio.com/docs/errors/21614", "status": 400
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