Is it possible for me to retrieve my lost iphone?

So basically my phone is an iphone 5 and it's updated to the recent update of ios 7 and I only just realised that I didn't activate my icloud account and there's no lock on my phone… What I was wondering, would i be able to trace down the thief even if they deleted my icloud account and changed it to theirs and did the whole restart process ( i think it's called restoration system something ) and inserted their own sim and take out mine… Please help!

I'm afraid it is hard for you to find the phone if you did not enable find my iphone on the device after update its os. I suggest you contact the service provider and Apple support to see if they can help.
Learn to be more careful in the future. To protect your new idevice from being stolen or lost in the future, I suggest you apply some free anti-theft apps like iLostFinder except set up Find My iPhone/iPad/iPod in iCloud on the device. Hope it helps.

http://ilostfinder.com/

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