That sounds very secure indeed. Nobody would ever guess that I'd recently called my folks! /s
No one would ever guess that my target called me back after I left a frightening voicemail also!
In Vietnam, scammers use a few numbers to call the target first, making those number the "most frequent recently", then take over the target phone number. This security model is terrible.
And conveniently Facebook often lists your relatives' accounts right on your profile.
So you could just call and leave a reasonable sounding voicemail compelling them to call back?
Is this true? Got a link for reference?
Sorry, no link. Just personal experience when we lost the account info for an employees phone.
Did you have a PIN/Passcode on the account [1]? That a 6-15 digit number you can set on an account that you have to supply when you call support, or have to give to your new carrier for them to get your phone number ported off of T-Mobile.