How do you correctly say you saw a number saved on your phone but you don’t know who the person is. Politely ask the person on WhatsApp

You can send a polite message like this: --- Hi [Name], I hope you're doing well! I noticed a number saved on my phone, but I’m not sure who it belongs to. Could you please remind me? Thanks so much! Best, [Your Name] --- Feel free to adjust it based on your relationship with the person!