Ios 5 Unsecured Calls Warning Lets Users Know If They Are Talking On Unencrypted Networks

One interesting feature of iOS 5 that we’ve been tracking since yesterday is that users have been reporting the above ‘unsecured call’ warning. While it isn’t in any of the documentation we’ve seen, it appears that Apple is warning users of the possibility that their phone calls can be eavesdropped on.

It likely warning of the possibility of a GSM IMSI Catcher basestation which can intercept unecrypted calls.  Wikipedia notes that unecrypted call detection isn’t new:

Video of a DEFCON talk on IMSI catcher below:

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