What do you think about this?

Ok so I lost my iPhone 4 at a bar on Monday. Checked Tue and today (Wed) to see if it was there and it was not. Only thing that confuses me is why whenever I call it, it still goes straight to voicemail meaning no one tried charging it (all it needs is an iPod cord and many people have those). And also you can't change the sim card on an iPhone anyway. Oh and it's in an Otterbox and if it works as it should, probably protected the phone.