■ Call Filter with Customizable Blocking Conditions

"Unknown Call Blocker" is a customizable call filter that allows you to choose exactly which types of incoming calls you want to block.

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■ Block Conditions You Can Choose
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● Block Blacklisted Numbers
Block specific numbers you have registered and never want to receive calls from again.

● Block Non-Contacts
Block calls from any number not saved in your contacts list.
(Contacts permission is only used when this specific option is enabled.)

● Block International Calls
Block overseas calls that include a country code (starting with +).

● Block Hidden / Private Numbers
Block calls where the caller ID is hidden (Private, Public Phones, etc.).

● Block 050 IP Phones
Block IP phone numbers starting with "050".

● Block 0800 Toll-Free Numbers
Block numbers starting with "0800".

● Allow Known Caller Names (Toggle ON/OFF)
Choose whether to allow calls that display a carrier-provided caller ID name (e.g., "City Hall").

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■ Guaranteed Call Delivery
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● Emergency Numbers Always Allowed
Emergency numbers detected by the network will always be allowed through, regardless of your blocking settings.

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■ Additional Features
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● Block History
View a list of when and which numbers were blocked. Supports deleting individual entries or the entire history.

● Block Notifications (Toggle ON/OFF)
Choose whether or not to display a notification when a call is blocked.

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■ Privacy
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All processing is handled entirely on your device.
Your contacts and call history are never sent to external servers.
Access to your contacts is requested only when the "Block Non-Contacts" feature is enabled.

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■ Important Notes
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• Blocked calls are processed silently without ringing. From the caller's perspective, it will behave the same as a "busy" signal.
• This app will only function when it is set as your device's default "Call Screening App".