Hello, if I call from my cell phone in a private number to another cell phone, is there an app to discover the number or other method?

If a number is private it will not appear or be disclosed in the records for third parties of other companies, if in addition to that the provider company offers that the telephone number be anonymous the caller ID of the caller will not show the caller's number. No program or application will be able to identify the number, but there are applications that the incoming calls and the number does not appear block them. I have that application and when someone calls me without knowing the number the application automatically blocks it regards

Hello how are you, this only happens if the phone you call your number does not appear in your phone book, if your number is in the phone book of that phone, there is no private call greetings.