I found an iPhone 4s. Can I use it?

In October 2012, I found an iPhone 4s in London, on a train. I was in London for a day trip.
I was worried if I turned it on that it could be tracked. My friend removed the sim-card and threw it away, whilst we were in London. When I got home I factory reset it.Am I able to be tracked with this phone? I haven't used it or turned it on since October.

Any idea what I could do. Can I use this phone? The IMEI number today and it has not been blocked, so is it usable? Can I be tracked for using it?

I don't want comments like "You thief", "send it back", I need help on what to do with it.

You know what to do with it you want us to aid and abet you that's illegal

Maybe you should of left it on the train because its someone elses property

Yes it can be traced.easily… I lost my phone few days back and i feel so bad for it… I did not just loose my phone but all the pictures, memories, contacts, so when someone looses a phone he just doesn't looses a phones, its much more than just a phone. You must find the owner and return the phone. If you really want to return the phone this website may help you finding the owner.
http://www.missingphones.org/

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