> 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 dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` 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 optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.