I'm not sure about "all our major telco's, but there is this:

https://en.wikipedia.org/wiki/Operation_Aurora

> On January 12, 2010, Google revealed on its weblog that it had been the victim of a cyber attack. The company said the attack occurred in mid-December and originated from China. Google stated that more than 20 other companies had been attacked; other sources have since cited that more than 34 organizations were targeted.