# Phone number formatting ## E.164 To ensure clean phone number formatting and effective phone number lookups, we recommend enforcing E.164 phone number formatting. Middle's Hubspot actions have options to re-format phone numbers in E.164 for upserts and lookups. {% embed url="" %} --- # 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.middle.app/middle-docs/guides/app-reference/hubspot/phone-number-formatting.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.