> For the complete documentation index, see [llms.txt](https://faq.blink.sv/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faq.blink.sv/creating-a-blink-account/what-information-do-i-need-to-provide-to-register-to-blink.md). # What information do I need to provide to register to Blink? You only need a smartphone and internet access. Download the app and open it — no personal information is required to get started. We recommend adding a phone number and email address to your account, which enables login recovery and unlocks additional features such as setting a username. Adding a phone number also allows you to increase your transaction limits if you choose Custodial Mode. Once you've entered your phone number, you'll receive an SMS or WhatsApp text message for account authentication. After that, you can create an optional unique username for Lightning Address and internal Blink transactions. Blink offers two modes of operation — Custodial Mode and Non-Custodial Mode — and the availability of each depends on your status and country of residence. See the Terms and Conditions for details. Please note that the username you create will be visible to other Blink users, so we recommend choosing your username with this in mind. Once registered it is recommended to [add an email address](/creating-a-blink-account/how-do-i-create-an-account-with-blink.md#add-an-email-address-optional) which you can use to log in going forward. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://faq.blink.sv/creating-a-blink-account/what-information-do-i-need-to-provide-to-register-to-blink.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. 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.