These details come from a DOJ case opened against Muhammad Fahd, a 34-year-old man from Pakistan, and his co-conspirator, Ghulam Jiwani, believed to be deceased.
The DOJ charged the two with paying more than $1 million in bribes to several AT&T employees at the company's Mobility Customer Care call center in Bothell, Washington.
The bribery scheme lasted from at least April 2012 until September 2017. Initially, the two Pakistani men bribed AT&T employees to unlock expensive iPhones so they could be used outside AT&T's network.
The two recruited AT&T employees by approaching them in private via telephone or Facebook messages. Employees who agreed, received lists of IMEI phone codes which they had to unlock for sums of money.
Employees would then receive bribes in their bank accounts, in shell companies they created, or as cash, from the two Pakistani men.
This initial stage of the scheme lasted for about a year, until April 2013, when several employees left or were fired by AT&T.