How do you unmask a blocked caller ID?
If you’re unable to call back or uncover the number and you don’t have a smartphone, you can trace the number for your carrier by dialing *57 in the United States. For this to work, you must answer the call when it comes in before you can trace it, and you must be prepared to follow up with local law enforcement.
Can you trace a blocked call?
Private numbers, blocked, and restricted calls can usually be traced. However, unknown, unavailable or out of area calls are not traceable because they don’t contain the data needed for a successful trace.
How do you find out a no caller ID number?
Dial *67 before the number you want to call. The receiver will not be able to see your phone number, and will see “No Caller ID,” “Private,” or “Blocked.”