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Enter a number that called or texted you and we’ll explain what its prefix and format reveal — premium-rate lines, high-cost international codes used in one-ring “wangiri” scams, and other patterns worth caution.
This is an educational, rule-based checker that runs entirely in your browser — nothing you type is sent anywhere, stored, or processed by AI. It classifies a number by its prefix and format patterns (premium-rate ranges, high-cost international codes, format quirks). It does not look a number up in any database and does not claim a specific number belongs to a scammer. Remember: caller ID can be faked.