iPhone is sharing with unknown device, how to find that device’s information?

Hi Mikey247d,

Thanks for posting in Apple Support Communities. It sounds like you have reason to suspect that your Apple ID might be signed in on another device. Right? You can use your iPhone to see where you are signed in. The following is from Check your Apple ID device list to find where you're signed in.

"Use your iPhone, iPad, or Apple Watch to find where you're signed in

1. Tap Settings > [your name], then scroll down. 
2. Tap any device name to view that device's information, such as the device model, serial number, OS version, and whether it's a trusted device that can be used to receive Apple ID verification codes. The information might vary depending on the device type. You might need to answer your security questions to view device details."

It also sounds like you might benefit from the information in If you think your Apple ID has been compromised. Following that guidance will help to secure your Apple ID and regain control.

Take care.

In addition, run Safety Check:

How Safety Check on iPhone works to keep you safe - Apple Support

This will show you what information you are sharing and who you are sharing it to along with the ability to stop the sharing.

You will want to change your Apple ID password, which was already suggested by following this support article:

If you think your Apple ID has been compromised - Apple Support

Yes and is going through to access my Apple Pay health

I want to find the person

how to find the person information