The Complete Guide to Auto Call Blocking
Everything you need to know about autocallable structured products and their risks.
Auto call blocking is a service that automatically detects and blocks voice phishing, spam, and telemarketing calls, protecting your daily life from unwanted interruptions.
Table of Contents
1. Service Overview
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
2. Signing Up and Activation
[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
3. Blocking Settings and Management
[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
4. Advanced Features
[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
5. Troubleshooting and Cancellation
[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
Key Tips
- •Set the blocking intensity to “Medium” for the best balance between protection and usability.
- •Add important contacts to your whitelist in advance to avoid accidental blocking.
- •If you receive a spam call, report it immediately to help protect others.
- •Enabling the call recording feature gives you evidence if you become a victim of voice phishing.
- •Check your blocking history regularly to make sure no legitimate calls were accidentally blocked.
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Have any questions?