This isn't new, but I wonder if it's related: "All SIMs could reject OTA message without Digitial Signature (DS), but this is rarely done as it brings addition

This isn't new, but I wonder if it's related: "All SIMs could reject OTA message without Digitial Signature (DS), but this is rarely done as it brings additional pain to gsm providers. Most of the SIMs are correctly secured. Most of the SIMs accept OTA messages that are not encrypted. Some SIMs accept OTA messages that only have a correct Cryptographic Checksum (CC) and some SIMs only require a correct Redundancy Check (RC) and also require counter increase N+1. Most of the SIMs dont require any security feature and accept OTA messages without no RC, CC or DS, for example - Globul. (by marek, TODO: name the networks!)." http://wiki.thc.org/gsm/simtoolkit#head-1c0ca2c9ebd6ac101c90f17c23b8779d1f6adf1f http://wiki.thc.org/gsm/simtoolkit#head-1c0ca2c9ebd6ac101c90...