You can always simply call the phone in hopes that the person who found it answers the call. Or you can leave a message. But more often than not, the phone isn't actually lost and has only been misplaced somewhere at home. In case your phone is on silent mode, it may be no use calling either, as tracking it could become difficult.
Samsung Find My Mobile
In such a situation, Samsung's Find My Mobile feature can come in handy. The feature has a function called 'Ring my device.' By using this function, your phone will ring for one minute at the highest volume level even if it is on silent or vibration mode, attracting attention and making it easier to find. Your phone can also display a brief message of up to 40 characters that can help if someone else comes across it.
You can enable the Find My Mobile feature through Settings --> Security --> Find My Mobile and register your Samsung account on http://findmymobile.samsung.com. Keep the Remote controls option on in order to remotely operate the phone through the website in case of loss.