Coming from this space, I can tell you that the fear of operators to _maybe_ break 0.1% of their customer's experience is a solid ground to not update. I have

Coming from this space, I can tell you that the fear of operators to _maybe_ break 0.1% of their customer's experience is a solid ground to not update. I have seen these discussions first hand (in Europe, early 2000) where we had to convince super large providers that they should update the crypto (an other issue: the refresh timing of the TIMSIs) and accept that some old (blackberry mainly at that time) devices would not be happy. Think about the numbers, some of these national providers have 20 million customers and there is nothing more expensive then 200.000 people contacting customer service or even leaving to the other provider since their phone does work there...