Just because T-Mobile doesn't have an iOS device on its store shelves doesn't mean that the carrier can't attend Apple's World Wide Developers Conference next week. By chance, the company has recently performed a small-scale roll out of its iPhone-friendly 1900 MHz HSPA+ service at the Moscone Center in San Francisco, CA; the very location of WWDC.

Although it may seem like T-Mobile is doing this as a way to crash the party, a spokesperson has told 9to5Mac otherwise:

While upgrading coverage inside the West side of the Moscone Center, T-Mobile has also deployed 4G HSPA+ service in the 1900 MHz band to test the live network on a small scale. As part of the company’s previously announced $4 billion network modernization effort, T-Mobile plans to launch 4G HSPA+ service in the 1900 MHz band in a large number of markets by the end of the year, which will make our 4G network compatible with a broader range of devices, including the iPhone.

NOTE: The time and location of this test is just coincidental.

T-Mobile has a tendency to not be shy about unlocked iPhones being used on its network, and is well aware that its 1900 MHz band pairs up with the phone quite nicely. The company has even been seen throwing a couple of jabs at the iPhone itself — and, indirectly, official iPhone carriers — by pitting it against its "4G" handsets in a somewhat questionable marketing campaign.