How simple it seems to be for national intelligence agencies to access our voice and data traffic. If the NSA in the US and GCHQ in the UK are doing this, simply by gaining access at source to the encryption codes for Sim cards through the emails of staff at one of the major Sim producers, then it is probably a safe assumption that other national or state sponsored intelligence operators are doing the same. The more critical your data, the more thorough and wide-reaching your checks on vulnerability will need to be, it would seem. Personally I remain concerned that for most of us (whether individually or in business) it is hard to be confident that you have this risk properly covered, in light of this sort of news.