No Caller ID is a recurring problem that never seems to fully fade out. The waves just come back every few months. Anonymous calls appear to be becoming more noticeable again, alongside ongoing robocall and spoofing activity. Some of the calls are harmless. Others are scams, phishing attempts, or even harassment.
The same problem is occurring again, and with each No Caller ID number call, you assume the worst. But you are not powerless, so let’s take a look at what’s happening, what you can do about it, and how you can tell what kind of call you’re getting.
Why No Caller ID Calls Are Surging Again
As anonymous calls become more common, many people want to find out who’s behind a No Caller ID number instead of simply ignoring the call. While hidden numbers can’t always be revealed, there are several methods to identify the caller before you take responsive action. A big reason for this surge in hidden numbers is how easy and accessible the technology behind them is. Several factors have driven this increase, including:
- VoIP apps or Voice over Internet Protocol apps allow people to place calls over the internet while hiding their real phone number.
- Call masking services are a commonly used tool by businesses, ride-sharing apps, and as a legitimate privacy tool that is regularly abused by scammers.
- Auto-dialing software that enables thousands of calls to be placed in minutes, making it easier to overwhelm spam filters.
- Caller ID spoofing is a method that allows scammers to display a fake number or even hide it altogether to make calls seem trustworthy or anonymous.
The biggest issue is accessibility. These tools are inexpensive and require minimal setup. For example, the average cost of VoIP for a small business is $15 to $30 per month, with enterprise plans being just $50+ per month. Carrier features like *67 still allow callers to intentionally block their Caller ID for select calls.
These tools have their legitimate users, but scammers exploit them just as easily. The issue is very serious, especially as anyone can start abusing the system at any moment. The low barrier to entry is exactly why scammers keep using them.
No Caller ID vs Unknown Caller – What the Difference Actually Means
No Caller ID and Unknown Caller sound similar, but they don’t mean the same thing.
The distinction matters because it gives you a hint at what’s happening. This does not mean that all Unknown Calls are trustworthy, just more likely a product of a technical issue. Treating both exactly is not the best solution, instead, always think through whether you are expecting a call.
Who Actually Makes These Calls – Legitimate and Otherwise
Not all anonymous calls are suspicious, as individuals and businesses hide their numbers to protect their privacy. Additionally, the rise of Voice AI is making it harder to quickly tell whether a call is legitimate, as AI-generated voices can now sound convincingly human. Examples of legitimate use cases include:
- Hospitals protecting patient confidentiality
- Law enforcement agencies during investigations
- Domestic violence support services
- Businesses during anonymous customer surveys
Unfortunately, scammers use the same approach, with common examples including:
- Government impersonation scams
- Bank or credit card phishing calls
- Robocall campaigns
- Aggressive debt collection harassment
Modern scams are also becoming more personalized. Many fraudsters use personal details like your full name, employer, home address, or close family members to make calls sound more convincing. This eliminates the guesswork and allows scammers to start with facts they already know, making social engineering much more effective.
How to Find Out Who Is Behind a No Caller ID Call
When it comes to figuring out a No Caller ID number, no solution works every time, but there are several options:
- Call Return *69: On most US landlines, it calls back the last incoming number, even if Caller ID was hidden. Availability depends on the telephone provider, but this is the easiest way to see the exact number.
- Malicious Call Identification *57: Dialing *57 is used when receiving threatening or harassing calls. Instead of revealing the number to you, it creates a trace that your phone company can provide to law enforcement. Again, availability depends on the telephone provider.
- Smartphone features: Can’t usually reveal hidden numbers. Instead, they need to use carrier spam protection or third-party caller identification apps. Additionally, most devices have built-in features that assist with unwanted calls.
Third-Party Apps – What They Can and Cannot Do
Third-party apps are a useful resource that can help identify anonymous callers, but none are perfect. Truecaller is a very popular option that compares incoming calls against a massive community-powered database to identify both legitimate and spam callers. The service's reliance on user-contributed information has its downsides for practice and privacy.
Another popular app in the US is TrapCall, an app that works by redirecting declined blocked calls. From there, it attempts to reveal the hidden number before reconnecting the call. However, the app cannot unmask spoofed numbers and may not reveal every network-level hidden call.
Third-party apps can help, but they aren’t foolproof. Another factor to consider is the privacy tradeoff. Most caller identification apps need access to information like your contacts, call history, and incoming call data. The information helps improve their service, but also directly shares your personal data with the service.
How to Block No Caller ID Calls on iPhone and Android
To block No Caller ID calls, you can simply adjust your device's settings. On iPhone, the process looks like:
- Open Settings
- Go to Apps
- Then Phone
- Tick Silence Unknown Callers
On the other hand, for Android devices, the process looks like:
- Open Phone
- Select Settings
- Go to Blocked Numbers
- Select Unknown
When it comes to Android devices, because of the variety, you might see slightly different names such as Block Unknown or Block Private Numbers. Overall, this is the simplest and easiest solution with minor drawbacks.
The Bigger Picture – Why Scammers Already Know Your Number
It's easy to assume anonymous calls are random, but that's often not the case. Your phone number can end up on data broker websites, people-search databases, public records, and information leaked in past data breaches. Once a scammer links your number to your name, address, or employer, they have enough to build a convincing story.
That's what makes targeted No Caller ID calls more dangerous than generic robocalls; someone who already knows your name is far harder to doubt. Blocking anonymous calls solves the symptom. Reducing how much of your personal information is publicly available makes you a far harder target in the first place.
