Governments around the world have access to “ stingrays,” devices that essentially impersonate a cellular tower. (However, if SMS is the only option you have available, SMS is better than nothing.) SMS Messages Can Be Monitored by Authorities An app that generates codes on your device or a physical security key is much more bulletproof. This is why security professionals have recommended against using SMS for two-factor authentication. This is particularly useful when compromising bank accounts, for example-the attackers can snoop on the verification codes that are generally sent via SMS, use them to access bank accounts, and drain them. The SS7 system has been repeatedly attacked by hackers who have snooped on SMS messages or intercepted them. This is how your phone can connect to a cellular network and make and receive calls, even when you’re in another country on the other side of the world. Mobile phone networks around the world are connected to each other through the Signaling System No 7 (SS7) protocol. Even if SMS isn’t particularly secure, it at least ensures that an attacker has to intercept an SMS message in addition to typing in your password. Requiring confirmation via SMS adds some additional security. It’s just that everyone has a phone number. But that reason isn’t because of security.
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