The Complete Guide to Auto Call Blocking

Auto call blocking is a carrier-provided service that uses AI to block spam calls in real time.

[Types of Calls Blocked]

• Voice phishing

• Smishing (text message fraud)

• Loan solicitation

• Home renovation ads

• Insurance telemarketing

• Illegal spam

[Supported Carriers]

SKT: T Spam Filter

KT: Spam Block 114+

LG U+: Spam Block

[Monthly Fee]

Free (basic blocking)

Premium: 2,000~3,000 KRW

[Automatic Enrollment (Free)]

Provided as a default feature by most carriers

Applied automatically without a separate application

[Premium Enrollment]

1. Carrier Customer Center App

• T World, Olleh KT, U+ Customer Center

2. Add-on Services Menu

• Search for “Spam Block” or “Auto Call”

3. Apply for Premium

• 2,000~3,000 KRW/month

• Advanced blocking features

4. Instant Activation

[Optional App Installation]

• Whoscall

• T Phone (SKT)

• Naver Safe Number

[Blocking Intensity]

1. Light: Obvious spam only

• Voice phishing

• Illegal loan solicitation

2. Medium (Recommended): Most spam

• Above + telemarketing

• Loan/insurance ads

3. Strong: All suspicious calls

• Above + all advertisements

• May block some legitimate calls

[Whitelist]

• Numbers that will never be blocked

• Family/friends

• Workplace/school

• Hospitals/government offices

[Blacklist]

• Numbers blocked manually

• Permanently blocked once added

• Can be removed at any time

[Premium Features]

1. Real-Time Number Lookup

• Check a number while the call is incoming

• Displays number of reports received

2. Call Recording

• Automatically record important calls

• Capture evidence in case of voice phishing

3. Blocking Statistics

• Daily/monthly blocked call counts

• List of blocked numbers

4. Text Spam Blocking

• Automatically block smishing messages

• URL link warnings

[AI Learning]

• Learns from user-reported data

• Continuously improves blocking accuracy

• Automatically adapts to new scam tactics

[When Legitimate Calls Are Blocked]

1. Check blocking history

2. Add the number to your whitelist

3. Change blocking intensity to “Light”

4. Unblock the specific number

[When Spam Calls Still Come Through]

• Switch blocking intensity to “Strong”

• Manually add to blacklist

• Use the report feature

• Consider changing your number

[When App Notifications Are Not Arriving]

• Check notification permissions

• Disable battery saver mode

• Allow the app to run in the background

[Canceling the Service]

1. Cancel through the carrier app

2. Call customer service

3. Cancellation takes effect immediately

4. Blocking history will be deleted

[Completely Free Alternatives]

• Whoscall

• T Phone (SKT only)

• Naver Whowho