T-Mobile may soon add the Sony Xperia Z to its lineup, as the smartphone is reportedly in the testing phase, getting ready to hit the carrier.

T-Mobile or Sony have yet to announce any official launch dates (if necessary), so this is just a rumor for now.

TmoNews reports seeing a Sony Xperia Z smartphone with T-Mobile branding, and provides an image with the branded back side of the device. According to the publication, it confirmed with "three separate sources" that the Sony Xperia Z is indeed in the testing phase, but notes that "there's absolutely no guarantee the device will ever hit store shelves."

The Xperia Z is the new flagship smartphone for Sony, and it is already available in various markets. It's been a while since Sony had a relationship with T-Mobile, and the Xperia Z would make a perfect return on the magenta network. T-Mobile already has an Android-heavy customer base, and the new Sony flagship would certainly be a welcome addition to the carrier's lineup. The Sony Xperia Z sports a 5-inch TFT display with a 1920 x 1080p resolution, a quad-core Qualcomm Snapdragon processor clocked at 1.5GHz and Adreno 320 GPU under the hood, as well as Android 4.1 Jelly Bean on board. Other features include a 13-megapixel rear camera with Exmor RS sensor, a 2-megapixel front-facing shooter, water resistance up to 30 minutes, dust-resistance and a glass-fiber polyamide frame.

The company touts its new flagship as "the best of Sony in an Android smartphone," and lists the device as "coming soon." TmoNews further notes that the Sony Xperia ZL has the required 1700 LTE bands for T-Mobile, but the model currently in testing is the Sony Xperia Z.

The Sony Xperia Z may not be drawing as much attention as the new Samsung Galaxy S4 or the HTC One, but it is a top-tier device nonetheless and plenty of T-Mobile customers would likely love to have it as an option.

On the other hand, just because T-Mobile is reportedly testing a device does not necessarily mean it will actually offer it to consumers. The HTC One X+, for instance, never made its way to T-Mobile.