You lost your iPhone/iPad or Macbook Pro? If you believe that your lost device is nearby, iCloud may help you find it. Here is how:
- Visit https://www.icloud.com/
- Sign in using your Apple ID
- Click “Find My Phone” (related: How to configure Find My iPhone: iCloud)

- Click “Devices”

- Select the device on which you want to find

- Click Play Sound (If your device is online, the sound plays immediately. If the device is offline, the sound will play the next time it is online.)

- Go follow the sound and locate your device.
Related:
My device (Mac, iPhone, iPad or iPod) was stolen or lost; what should I do?
Secure your iOS device (iPad, iPhone or iPod Touch): How to protect your information and data