You can set your phone to reject blocked numbers. For most service providers, you pick up your phone and dial *77.

If a number is unknown or out of area, the only way the number can be obtained is through Call Trace. It will not provide you with the number, only the telephone company or law enforcement officials. There is usually a fee for this and is usually used for tracing harassing calls.

If you know the number you can use http://www.anywho.com/rl.html

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Maybe you can try this.

Please visit website http://reverse.phonesguide.com.cn ,and you will get some details of the phone number for free.

Full Phone Reports include up-to-date information for (when available):

Phone owner name and current address
Line type - landline or mobile
Household members
Phone company and carrier
Possible neighbors and relatives
Issuing location
Satellite maps
Other phone numbers belonging to owner
Owner's address history
And more!
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May you good luck !

Sorry but I think only the police are allowed to do that.