How to Find Out Unknown Caller Number

By Joanne Cichetti

Updated September 22, 2017

Find out who's been calling you!
i calling emergency call image by Robert Wróblewski from

If you receive annoying phone calls from unknown callers on a frequent basis, then identifying these calls may be a priority to you. Although these calls aren't always easy to identify, there are a few options to try to find out who's calling you from an unknown number.

Use *57

One option to try to discover the identity of an unknown caller is a 57 call trace. Though this option does not work on all unknown calls, it does work on some so it's worth trying. To use it simply dial 57 on your phone and you will be given the previous caller's number. In some areas, dialing this code, after an unknown or restricted incoming call, automatically identifies the number. Carriers such as Verizon and AT&T offer the *57 service. If this code doesn’t work, ask your particular service provider for the code that works in the area where you live.

Contact Your Phone Company

Contact your network provider and ask whether it provides the Anonymous Caller ID service. With this service, your phone will automatically check the authenticity of each call that comes on your phone. If the call comes from a restricted or unknown number, this service will force the caller to unblock the number before he can complete the call. Once the number is unblocked, you will see it on your Caller ID screen.

Contact your telephone company and inform them that you are getting unknown calls. You may be asked to note the date and the exact time of the calls so it can trace the caller. You may also be asked for your name and phone number. The company will then either contact the caller or the caller’s company to tell her to stop calling.


You still have another option to try even if using *57 call trace or calling your phone company does not reveal the identity of the caller. TrapCall is a paid service that unmasks blocked and unknown callers by having you decline the call and then the same caller rings back with the number visible to you. The service also allows you to blacklist callers, record incoming calls and stop robocalls with spam blocking. The service starts at $4.95 per month and increases in price depending on what features you would like included in your plan.