SIM swap
Regulation & taxFraud in which a duplicate SIM is issued on your number to intercept OTPs.
In plain terms
The symptom is your phone quietly losing network. Treat that as an emergency.
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Glossary
Every term is defined twice: once the way a filing would put it, and once the way somebody would explain it to you across a table. The second one is usually the one that sticks.
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Two-factor authentication
Regulation & taxAlso called: 2FA
A second verification step beyond a password.
In plain terms
Use an authenticator app rather than SMS — a SIM swap defeats SMS entirely.