Shares in mobile operator mm02 have taken a battering today after bad news from rival Vodafone and a scathing research note from independent broker Collins Stewart (it used to be - ooh, all of two years ago - that research notes like this predicted certain telcos/high-tech companies were the next big thing, and sent their stock soaring). But some things don't change. Now, as then, it's still interesting to note how one report on a report can be so different to another report on a report, despite both covering much the same areas and even using the same quotes. One suggests the whole mobile sector is doomed. Another suggests mm02 has specific, unique problems.