Open the Phone app
Tap Recents
Look for calls labeled No Caller ID, Unknown, or Private
Check if the number is hidden in the call log details
Use Silence Unknown Callers in Settings > Phone to manage hidden calls
Contact your carrier to ask about caller ID blocking options
Use a call-tracing service if your carrier supports it
Save the hidden number if it appears in voicemail or call forwarding records
Enable voicemail and review messages from unidentified callers
Use a third-party caller ID app if allowed in your region