Email: admin@secure.online
Use case: Voice-based two-factor authentication (no SMS, no MMS).
Message content: \"Hello [name], this is [business] verification. Your one-time code is [123456]. This code expires in 5 minutes.\"
Opt-in & compliance:
- Users enable 2FA and provide their phone voluntarily.
- Confirmed via email and a test call.
- Full opt-in records maintained. Opt-out anytime.