In times of dramatic change, M&A levels always leap. Companies which are threatened by the rise of new technologies and business models huddle together for warmth and scale; organizations which want to ride the new wave look around for clever innovators to bolster their arsenals. As the mobile business transforms into a digital industry, the established giants need to make canny acquisitions to help them reinvent themselves, while the newcomers from the web and IT spaces need to gain mobile comms expertise at the same time as staying a step ahead of their direct rivals. The past week has been a particularly active one in M&A terms, and four deals are noteworthy because they reflect some of the most important…