The company also announced that it will enable its phones to allow customers to seamlessly be transferred onto WiFi networks where its network doesn't reach. While rivals Verizon and AT&T networks stretch almost across the country, T-Mobile's network is clustered around urban centers.
Current subscribers can trade in their devices for phones enabled with Wifi connectivity when they sign up for the company's early upgrade program.
The carrier is also offering a free personal CellSpot site customers can place wherever they lack coverage.
The move comes the day after Apple Inc. announced it will release an iPhone programmed with technology to allow automatic shifts between WiFi and carrier networks.
"Apple's announcement set the road map for this," said Legere at the event. "It gives us the option to turn the wireless industry on its head starting with trashing the old rules about where cellular ends and WiFi begins," he said.
Major wireless carriers have amped up their promotions in the face of the Apple's new iPhone 6 release on Tuesday, in an attempt to poach customers from each other in a nearly saturated market.
Earlier on Wednesday, AT&T announced it is offering customers the iPhone 6 with no immediate down payment required when subscribers sign up for its equipment installment plan.
Sprint Corp announced on Tuesday a program that allows customers to lease the iPhone 6 and get the latest iPhone model every two years for $20 a month when they sign up for an unlimited plan.
Verizon Communications will give subscribers who trade in an old iPhone a free iPhone 6 in exchange for a two-year contract.
Earlier in the week, T-mobile announced it will match any deal in the industry.
(This story, first published on September 10, has been corrected to fix the details of the AT&T offer in fourth to last paragraph)
