# eSIM **eSIM (Embedded SIM)** is a programmable chip embedded within a device.\ Users can activate or switch network services by remotely downloading carrier profiles — without replacing a physical SIM card. Compared to traditional SIM cards, eSIM technology: * Eliminates the need for logistics and physical delivery. * Supports storing multiple carrier profiles on one device. * Allows switching between networks at any time with ease. Based on this technology, **RoamFi** provides cross-border data services across multiple global regions, making international connectivity more convenient and flexible. Currently, RoamFi’s eSIM service focuses exclusively on **mobile data access**, featuring the following characteristics: * **Data-only service:** Voice calls and phone numbers are not included. * **No KYC required (Know Your Customer):** Users can register using only an email address, ensuring privacy protection and a low entry barrier. * **No network restrictions:** Users can freely access global internet resources for an open and flexible browsing experience. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.roamfi.net/product-elements/esim.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.