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Re:California Police Used Stingrays in Planes to Spy on Phones by detaro on Thursday January 28, 2016 @12:45AM (#10986534)
You seem to be right. There is a paper about fast attacks against A5/3, but according to the authors it doesn't necessarily apply to real attack scenarios.

https://eprint.iacr.org/2010/013

Re:California Police Used Stingrays in Planes to Spy on Phones by yuhong on Thursday January 28, 2016 @03:34AM (#10987100)
Yea, related key attack I think.