Oh I disagree. High-security engineer Clive Robinson has been writing online about SS7 and similar protocols risks for years. In posts like this...<p><a href="https:&#x2F;&#x2F;www.schneier.com&#x2F;blog&#x2F;archives&#x2F;2015&#x2F;08&#x2F;ss7_phone-switc.html#c6703762" rel="nofollow">https:&#x2F;&#x2F;www.schneier.com&#x2F;blog&#x2F;archives&#x2F;2015&#x2F;08&#x2F;ss7_phone-swi...</a><p>...he points out that telecom and spy agencies were very tight in U.K. (and often U.S.). Many features that benefit spying are there on purpose. As he predicted, they continued to be a problem in upgrades due to the compatibility argument and downgrade attacks following. Worst, certification or connection to a major wireless standard might force you to include weak crypto or security in your product.<p>It&#x27;s all crap in terms of security. Sure they&#x27;re reliable... amazingly so in some cases... but they&#x27;re not secure and that&#x27;s on purpose.