AT&T said three of its employees secretly installed software on its network so a cellphone unlocking service could surreptitiously funnel hundreds of thousands of requests to its servers to remove software locks on phones.
The locks prevent phones from being used on competing networks and have been an important tool used by cellular carriers to prevent customers from jumping ship. They can be electronically removed, usually after fulfilling a contract obligation, but many websites offer the same service for a small fee with no questions asked.
AT&T's allegations are made in a filing with U.S. District Court for the Western District of Washington in which it accuses two companies, four people and an unknown software developer or developers, of participating in the audacious scheme. AT&T filed its lawsuit on Sept. 11 but it was first reported by Geekwire on Friday.
The carrier first discovered something was amiss in September 2013 when a surge in the number of unlock requests alerted the company to the possible abuse of "Torch," the software used to unlock cellphones, it said in the complaint.