SecondSIM for Tinder Verification

Tinder requires phone verification for every new account and uses carrier-level detection to prevent one person creating multiple accounts (which is against their terms). Their system actively blocks known VoIP ranges and has one of the most aggressive "delayed ban" systems — where an account created with a virtual number appears to work for a few hours before being shadow-banned or permanently disabled.

Tinder also uses phone number reputation scoring, where numbers previously associated with banned accounts are blacklisted. VoIP numbers from popular "second number" apps are particularly vulnerable because the same number range may have been used and banned thousands of times.