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Out of band communication via SMS has recently been shunned due to SS7 hacks. How likely are these to become more prevalent? I saw this question:

Should 2FA over SMS be considered insecure in the wake of recent SS7 attacks?

But nothing I have seen shows how easy / difficult they are to perform? And how common they are?

marked as duplicate by S.L. Barth, Tobi Nary, Steve, Community Oct 9 '17 at 13:04

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