Telegram Username Phone Number Lookup

I need the phone number linked to a single Telegram username. My goal is purely verification, so the number must be accurate and in service. I have no fixed tools in mind and will rely on your recommendations—scripts, OSINT techniques, private databases or any other reliable method you trust are all welcome. Any approach that yields a correct result is acceptable to me.

Deliverables:
• The active phone number associated with the supplied username
• A concise explanation of the steps, toolset or workflow you used, so I can replicate the process later if necessary

Please let me know your estimated turnaround time and any information you require to get started.