Your Android phone already has a spam call fighter built in. You do not need to download anything or pay a monthly fee to turn it on.
Most Android phones, including Pixel, Samsung and many other brands, use an app called Phone by Google (usually it just shows up as “Phone”). It comes with a free feature called caller ID and spam protection.
This guide walks you through turning that feature on, step by step, along with the extra blocking options sitting right next to it. It also covers when your carrier’s own spam-blocking service is worth adding on top.
If you want a broader overview of every way to cut down on spam calls, our guide on how to stop spam calls on Android covers more ground. This article focuses only on the built-in settings and exactly where to find them.
How Do I Turn On Caller ID and Spam Protection on Android?
To turn on caller ID and spam protection, open your Phone app, tap the three dots in a corner, tap Settings, tap Caller ID and spam, then turn on See caller ID and spam. Here is the full walkthrough.
Plain talk: caller ID and spam protection
This is a free feature that labels incoming calls as a business name, “Spam,” or “Scam Likely” before you answer, using information Google has gathered about that phone number.
Step 1: Turn On Caller ID and Spam Warnings
- Open the Phone app on your Android phone.
- Tap the three dots (More options) in a top corner of the screen.
- Tap Settings.
- Tap Caller ID and spam.
- Turn on the switch next to See caller ID and spam.
Once this is on, an incoming call from a number that is not in your contacts may show a business name, or a warning like “Spam” or “Scam Likely,” right on your screen while the phone is ringing.
According to Google’s support page for this feature, this setting is already turned on by default on many phones. It is still worth checking, since some people turn it off by accident or it was switched off during setup.
Step 2: Turn On Automatic Spam Call Filtering
Labeling a call is not the same as blocking it. Your phone will still ring for a call marked “Spam Likely” unless you also turn on filtering.
- Open the Phone app and go to Settings > Caller ID and spam again.
- Turn on Filter spam calls.
With this on, calls Google identifies as spam are silenced instead of ringing through. They still show up in your call history and voicemail, so you can check later, but you will not be interrupted or see a missed call notification for them.
Spam filtering is not perfect. It can occasionally miss a real spam call, and very rarely it can silence a call you actually wanted, such as a delivery driver calling from a new number. Check your call history every so often rather than assuming every filtered call was junk.
Step 3: Block a Specific Number
If a number keeps calling you and you are sure it is spam, block it directly.
- Open the Phone app and tap More (or the clock icon) to see Call history.
- Find the call from the number you want to block.
- Tap it, then tap Block / report spam.
- Confirm when asked.
Once a number is blocked, your phone declines calls from it automatically. If you use visual voicemail, blocked callers cannot leave a voicemail either.
To undo this later, go to Settings > Blocked numbers, find the number, and tap Unblock.
Step 4: Decide Whether to Block Unknown or Private Numbers
Your Phone app can also block every call that arrives without any caller ID information at all, sometimes shown as “Unknown” or “No Caller ID.”
- Open the Phone app and go to Settings > Blocked numbers.
- Turn on the toggle for Unknown.
Safety tip
Some legitimate callers, including some doctor’s offices, pharmacies and delivery companies, show up as “Unknown” because of how their phone systems are set up. Turning this on can block calls you actually want. Try Steps 1 and 2 alone for a week or two first, and only add this step if unknown spam calls are still a real problem for you.
If Your Phone Looks Different: Other Phone Apps
Not every Android phone uses the same Phone app by default. Some Samsung phones use Samsung’s own Phone app instead of Phone by Google, with a similar feature called Smart Call that works the same basic way: a Settings menu with a caller ID and spam toggle. If the steps above do not match what you see, look for a gear or three-dot icon inside your own Phone app and search its Settings for the words “Caller ID,” “Spam,” or “Smart Call.”
Should You Also Turn On Your Carrier’s Spam Blocking?
Turning on the Phone app’s own protection is the first layer. Your cell carrier can add a second layer, since it can watch call patterns across its entire network, not just your one phone.
The three major US carriers each offer a free spam tool:
| Carrier | Free service | What it includes free |
|---|---|---|
| AT&T | ActiveArmor | Fraud and spam call blocking, caller ID and reverse number lookup |
| T-Mobile | Scam Shield | Scam Likely labeling, Scam Block (dial #662# to turn on), spam text filtering |
| Verizon | Call Filter | Spam detection, a spam and blocked call log, and a spam report option |
Each carrier also sells a paid upgrade with extra features, such as a personal block list or a full caller ID lookup tool. None of these paid upgrades are required to get real spam protection. The free tier from your carrier, combined with your Phone app’s own settings from the steps above, covers the basics well. Search your carrier’s name plus the word “spam” in the Play Store, or check your carrier’s own app, since the free spam tool is often already installed and simply waiting to be turned on.
Caller ID Can Be Fooled: What These Tools Cannot Do
Even with every setting above turned on, a scammer can still get through, because caller ID can be faked. This is called spoofing.
Plain talk: spoofing
Spoofing is when a caller deliberately fakes the number or name that shows up on your caller ID, so a call looks local, familiar, or even like it is coming from a real business or government agency.
The FTC warns about a version of this called neighbor spoofing, where scammers match a caller ID number to your own area code so you are more likely to answer, according to the FTC’s guide on blocking unwanted calls. The FTC also notes that the faked name and number often belong to a real person who has no idea their information is being misused.
This means caller ID labels are a helpful warning sign, not a guarantee. A call that shows no warning at all can still be a scam, especially a new number the system has not seen before.
Say this
“I’m not comfortable discussing this over the phone. I’ll call this organization back myself using the number on their official website or on my bill.”
That one line works for almost any unexpected call asking for money, gift cards, your Social Security number, or remote access to your computer. If you want more specific scripts for common scam calls, our guide on tech support pop-up scams and our guide on Medicare scam calls both include word-for-word examples.
If a scam call does get through despite all these settings, our guide on where to report a scam walks through exactly who to contact next. Our Scam-Stopper Kit (free when you join our email letter) includes a printable checklist you can keep by the phone for exactly this moment.
Where to Go From Here
Turning on caller ID and spam protection takes about two minutes and does not cost anything. Combined with your carrier’s free spam tool and a little healthy caution about unexpected calls, it removes most of the daily noise from scam callers.
For more on choosing and setting up an Android phone the easy way, from spam protection to everyday settings that make a phone simpler to use, see our book Your Android Phone.
