How to trace iphone which is lost and switched off?

Apple iphone 4s

If there's a sim card inserted into it, you can trace the phone by knowing the no.of the sim card

Lost. And found.

If checking the usual spots hasn't turned up your missing device, Find My iPhone can help.4 Just sign in at iCloud.com or use the Find My iPhone app on another device to locate yours on a map, display a message on its screen, remotely set a passcode lock, or initiate a remote wipe to delete your data. With iOS 6, iCloud offers Lost Mode - making it even easier to find and protect a missing iOS device. Lost Mode immediately locks your device with a four-digit passcode and sends it a message displaying a contact number. That way a good Samaritan can call you from your Lock screen without accessing the rest of the information on your device. While in Lost Mode, your device even keeps track of where it's been and reports back to you when you check in at iCloud.com or on the Find My iPhone app.

But a colleague of mine forgot to set up Find my iPhone on her mobile. It's lost/stolen, and turned off. Anything to do but pray?