So, a bunch of SIM card keys were most likely stolen, but Gemalto claims that this would only affect 2G networks.
Supposing all that is true, it's still the case that 2G networks exist alongside the 3G and later networks. Is that enough to effect an intercept?
Would it be possible then to cause connections 3G or later networks to fail, so that devices would fall back on the compromised 2G network?
What specifications would I need to be familiar with to understand this stuff?