T-Mobile USA remains the only major U.S. wireless carrier that doesn’t sell the iPhone, but the company’s wireless network will be at its best for people using unlocked iPhones on its network at Apple’s Worldwide Developer Conference in San Francisco next week.

With the help of one of its readers, the tech blog 9to5Mac this week discovered that T-Mobile had turned on the “4G” HSPA+ service in the 1900 MHz band in a small area around Moscone Center — perfect for unlocked iPhones running on the T-Mobile network. The reader noticed the change (technically from Edge to 3G) when walking by the venue.

T-Mobile confirmed the test in a statement to the site but said the timing and location were “just coincidental.”

WWDC kicks off Monday morning with a keynote presentation by Apple starting at 10 a.m.

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