As mentioned in another comment, SMS isn’t as secure as a dedicated authenticator app. But it has a couple of advantages.
– Not everyone has a smart phone and so can’t install a dedicated app.
– Authenticator apps can be a pain when you move to a new device. Some will transfer over, others may not. SMS doesn’t have this problem.
– Almost everyone knows how SMS works, authenticator apps are a bit more complex. Less technically minded people may have trouble installing, setting up, and transferring codes.
– Even with SMS being less secure, it’s still more secure than nothing at all. Every extra layer or step the attacker has to go through decreases your chance of getting compromised. It’s just not the best step to take.
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