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Call Patterns:
- Frequent and high-volume calling to a large number of recipients in a short period may trigger the spam label.
- Calls originating from certain geographic locations or using specific area codes associated with spam can be flagged.
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Call Behavior:
- Calls that are abruptly terminated or have very short durations might be indicative of spam.
- Repeated calls to the same number within a short time frame could trigger the spam label.
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Number Reputation:
- Carriers maintain databases of known spam numbers. If a number has been reported by multiple users as spam, it is more likely to be labeled as "Spam Likely."
- New or recently activated numbers might be scrutinized more closely.
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Call Content:
- Certain keywords or phrases commonly associated with scams, telemarketing, or phishing activities may contribute to triggering the spam label.
- Automated messages or recorded content resembling known spam messages may lead to the identification of spam.
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User Reports:
- Feedback from users who mark calls as spam or report them as unwanted is a crucial aspect. Carriers may use this information to continually improve their spam detection algorithms.
It's important to note that the specific criteria and algorithms used by carriers to determine spam likelihood may not be publicly disclosed due to security and anti-abuse concerns. Additionally, false positives can occur, where legitimate calls may be mistakenly labeled as spam. Users can often review and manage their call blocking or spam settings to customize their preferences.