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In the memo to employees, the company notes staff will be receiving training material regarding "selling against the iPhone" as well as updated micro-SIM kits purportedly slated for use in unlocked iPhones. The Monthly4G packages support iPhone 4 and iPhone 4S models and will possibly be used on T-Mobile's recently refarmed 3G network.
The carrier announced in January that it would be offering coverage for subscribers with unlocked iPhones, and went as far as to initiate a support program for its roughly one million customers who use Apple's device.
As for the materials regarding an attempt to sell against the Apple handset, T-Mobile is no stranger to iPhone launches and the damage it can do to a network's subscribership. The company in February claimed that it lost some 700,000 contract customers due to the iPhone 4S launch in 2011.
T-Mobile is the last major U.S. wireless company to be without Apple's popular device, as Sprint joined AT&T and Verizon in selling the smartphone last year. Even smaller regional operators like C-Spire have been added to the list of iPhone-carrying networks.
Apple is expected to debut the sixth-generation iPhone at an as-yet-unannounced special event on Sept. 12, with a U.S. rollout following on Sept. 21.