8x more accelerated
6x less disk, CPU, and
You probably love your smartphone – except for maybe the phone part and, in particular, the telemarketers often on the other end of the line. Telemarketers make 148 million annoying, time-wasting calls per day1 and do-not-call lists (where available) do not work2, 3 (and weren’t even meant to for many types of telemarketers4). Callblock is the first iOS app that helps prevent these calls and related text messages.5
Based on our benchmarking, the app identifies 86.7 percent of telemarketing calls correctly with a false-positive rate of only 1.7 percent on average.6
Callblock is something of a sequel to our ad blocker, Adblock Fast, which has 3,000,000 users and is rated 4.5 and 4 stars in the App Store and Google Play since launching alongside iOS 9 then the Samsung Galaxy S6. We’ve built on our experience filtering online advertisers to compile, classify, and apply the world’s biggest directory of telemarketers, featuring millions of entries from almost every country in the world.
With the app, you can:
- Filtering ruleset
- Install filesize
- Page load time
- Peak CPU use
- Peak memory use
- 49,002 rules 49K rules
- 843 KB
- 162.5 MB
- Adblock Fast
- 7 rules
- 97 KB
- 58.5 MB
- Adblock Plus ABP
- 49,002 rules 49K rules
- 543 KB
- 158.0 MB
1. Reduce unwanted calls and texts by more than 85 percent.
2. Filter more than 3,000,000 telemarketers by type.
3. Add and report missing or misclassified telemarketers.
4. Just tap to caller-ID only rather than block telemarketers.
- Facts and figures on telemarketing, The Houston Chronicle, accessed September 6, 2016.
- Cutting off robocalls, The Federal Communications Commission, accessed September 6, 2016.
- Do-not-call list “useless”, critics say, The Canadian Press, accessed September 6, 2016.
- Who may or may not call?, The Federal Trade Commission, accessed September 6, 2016.
- Callblock’s new iOS app will block calls, TechCrunch, accessed September 7, 2016.
- Calls were sampled and Callblock’s identification of telemarketers, evaluated in May 2017.
Show or hide the raw benchmark data.
Callblock blocks unwanted telephone calls and iMessage, SMS, and MMS messages. To enable the app to block calls and texts:
- press the Home button on your iPhone,
- tap the Settings app,
- tap Phone > (under CALLS) Call Blocking & Identification, then
- toggle the Callblock switch on.
To unblock calls and texts, go to the Callblock app. To add, remove, or reclassify a missing or misclassified caller, tap the Add caller button.
Enabling Callblock or making changes in the app may require up to a minute to take effect.
Frequently asked questions
Who makes Callblock?
What’s an Unclassified caller in Callblock?
An Unclassified caller is one Callblock has identified as a telemarketer but not yet which type.
Which countries does Callblock work in?
Callblock can screen telephone calls and text messages from almost every country in the world – 174 of the 193 recognized by the United Nations and so many that naming which countries are not supported is a whole lot easier. They are:
The Dominican Republic
The Marshall Islands
Saint Kitts and Nevis
Saint Vincent and the Grenadines
Trinidad and Tobago
The countries Callblock supports are:
Bosnia and Herzegovina
The Central African Republic
The Czech Republic
The Democratic Republic of the Congo
The Ivory Coast
Papua New Guinea
Sao Tome and Principe
The Solomon Islands
The United Arab Emirates
The United Kingdom
The United States
Where does Callblock’s directory come from?
Callblock’s directory of telemarketers is compiled from public and private records, the results of our ongoing research and testing, and user reports. An average of more than 10,000 new entries are added to the directory and existing entries, reclassified daily. The app autoupdates to include these changes.
When will Callblock be available on [insert platform here]?
Why is a subscription required if Callblock was purchased?
You don’t need a subscription if you bought the first version of Callblock, but later versions can’t determine that you did if you’ve since deleted the app. Forward your App Store receipt to firstname.lastname@example.org, though, and we can credit you with a subscription.
How can a subscription to Callblock be canceled?
Apple (not developers, like us) handles subscriptions in iOS. See their instructions for managing your subscriptions.
How much does Callblock cost?
You can try Callblock free for a month. Afterwards, the app is $1.99 monthly or $19.99 yearly.
Is allowing Contacts access required to use Callblock?
Unlike similar apps, Callblock doesn’t need to access your Contacts and doesn’t collect or sell your Contacts data.
Are Unknown callers blocked by Callblock?
Callblock can’t block any call or text without a caller ID. This is an iOS limitation, but most telemarketers attempt to seem legitimate by not blocking their caller IDs.
Does Callblock list blocked calls somewhere?
Calls blocked by Callblock are sent directly to your voicemail. To check which messages are from such callers, press your Home button, tap the Phone app, then tap the Voicemail tab. Blocked callers will be annotated with caller-ID info. (If you’ve set Callblock to caller-ID only, you can check which calls the app has identified as being from telemarketers by tapping the Recents tab.)
Can a missing caller be added to Callblock?
To add or remove a missing or misclassified caller to or from Callblock’s (local) directory (and to report the caller for review to help improve the distributed directory), tap the Add caller button, enter the caller’s telephone number, and choose which type the caller is or the Not a telemarketer option if the caller isn’t a telemarketer.