You should.
What's not clear is whether these were SIM Ki keys of already existing SIMs in the market. If these were new to be deployed SIMs, then they are as good as trash.

./bernard

From: Odhiambo Washington via skunkworks
Sent: ‎2/‎22/‎2015 12:15 AM
To: Skunkworks Mailing List
Subject: [Skunkworks] The Greatest SIM Heist - should anyone be worried? Notme:)

https://firstlook.org/theintercept/2015/02/19/great-sim-heist/

Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254733744121/+254722743223
"I can't hear you -- I'm using the scrambler."