3.3 million phone calls wiretaped with a single order issued by the US Authorities.

"The wiretap order authorized an unknown government agency to carry out real-time intercepts of 3.29 million cell phone conversations over a two-month period at some point during 2016, after the order was applied for in late 2015.."

Source and more info can be found at: http://www.zdnet.com/article/one-federal-wiretap-order-recorded-millions-phone-calls/