Twilio has expanded its capabilities in the UK by launching Twilio SMS, allowing customers to send and receive text messages using domestic UK phone numbers at a low cost of 4¢ USD per message. This move is part of Twilio's efforts to expand its services worldwide, including the launch of Twilio numbers in five new European countries. The service is available to all UK customers with access to the Twilio SMS API, and UK customers can send and receive text messages using domestic UK phone numbers immediately. Non-UK customers should note that this is a domestic messaging product for sending messages to UK numbers only, and international message delivery may not be guaranteed. To help developers get started with Twilio SMS in the UK, Twilio has provided resources such as API documentation, SDKs, and sample apps. The service is expected to benefit companies like AirBnB and Zendesk, which are using Twilio for communication services.