Use a legitimate phone-finding service on the device, such as Find My Device or Find My iPhone
Sign in to the account linked to the phone
Select the phone from your device list
Choose the option to make it ring or play a sound
Ensure the phone is powered on and connected to the internet for remote ringing
If you mean checking network reachability, use the phone number only through your carrier or authorized network tools
If you need to locate your own lost phone, use the manufacturer’s official recovery service
If you need to contact someone, call or text the phone directly