Here is a 1-paragraph summary of the text: The LinkIt ONE dev board in the SIGNAL hackpack can be used to add cellular data to IoT projects using Twilio Programmable Wireless, which utilizes a Twilio SIM card. To get started, users need to set up their board and activate their Twilio SIM card, then attach the cellular antenna if necessary. The MediaTek LinkIt ONE SDK includes a library for working with the cellular functionality of the board, which can be included in an Arduino project using the Library Manager. A sample code example demonstrates how to connect to a URL on putsreq.com using the LGPRSClient class and send an HTTP GET request, allowing users to test the Twilio Programmable Wireless capabilities of their board.