There are several search services online which can identify where a phone number is located in the world. Identifying a phone number's owner is a little more difficult than simply tracing its location.
Most phone search services found on the Internet do a very good job of narrowing a phone number down to the city where it is registered. However, going much beyond this requires a bit more information and may cost a little money in the process. Reverse phone number look up services were once available in many places for free. Today, the information is valuable enough for many people to charge for it.