# What document should I provide to upload proof of ownership? If the phone number you're trying to onboard is already associated with an existing account on the truecaller app, you'll be required to verify ownership. You can either choose a different number or upload a proof of ownership document to proceed. Accepted documents include a SIM purchase bill, telecom invoice, or any official document that clearly shows the sender owns the number. Supported formats are PNG or PDF. --- # 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.truecaller.com/truecaller-for-business/business-chat/faqs/sender-management/what-document-should-i-provide-to-upload-proof-of-ownership.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.