There was one really good talk about from black hat or defcon [1] but there's also this [2] which seems more thorough so I'm gonna watch it too later. I happen to have a friend who writes software for simcards so that's what really was my main source.

1. https://www.youtube.com/watch?v=scArc93XXWw

2. https://www.youtube.com/watch?v=31D94QOo2gY