Various phone companies offer such an option as an 'add-on' to their service which will either call back or dispaly the last number that called you.
If you are referring to a full-fledged legal tap on a specific number to determine which numbers it is communicating with, you must get a court order in order to make it lawful.
about 2 minutes
The FBI can trace a phone call to a location within 10 meters.
Hang up and call the police to trace the number.
Tracing a phone call can take anywhere from a few minutes to a few hours, depending on the complexity of the situation and the cooperation of the phone service provider.
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trace the call...
If you are the legal owner, you can get copies of call logs and locations where calls were made from the cell phone service provider.
Think of it this way: Call display is essentailly tracing a phone call. You see who is calling right away. Same principle applies to tracing a phone call. It all happens as soon as you finish dialing the number.
many people don't leave a trace behind. They are very hard to track.
If they can obtain evidence that you made an anonymous phone call in which you defamed another person, yes they can sue you. Phone calls are easier to trace with modern technology.
There is not a way to trace a call. Only the police officer can trace a call.
Tracing a call typically takes a few minutes to a few hours, depending on the complexity of the situation and the cooperation of phone service providers.