Originally Posted by jackal

Definitely.

However, I've had some troubles with Find My iPhone getting activated after switching SIM cards. When I put an Irish SIM in my phone, the SIM had no credit and so the device was unable to send the normal FaceTime activation SMS/MMS, and I think that also blocked Find My iPhone from becoming active on the new SIM. I also had trouble in South Korea, and I really had to mess with the FaceTime and Find My iPhone settings to get it activated when I put my New Zealand SIM in.

For those of us who travel internationally and regularly put different SIM chips in, you really need to test and make sure that Find My iPhone is active and working. I may very well have been able to recover my stolen iPhone 5 in Ireland if Find My iPhone had been working.