The T-Mobile-based Nokia Lumia 710 users have some bad news to follow on.

Per reports, T-Mobile has decided that the company will not be authorizing its Nokia 710 users to receive the official Windows Phone 7.8 update, when all other carriers are pushing out the new update for their Nokia smartphones.

The new information was passed on by a 710 owner who contacted Nokia to confirm if the update is actually going to happen on his smartphone, to which the company's customer service responded by stating that the company apologizes due to the fact that T-Mobile will not be supporting the update.

"In response to your concern, we understand that you want to confirm if the Windows Phone 7.8 will be available for Nokia Lumia 710 from T-Mobile. We are sorry to inform you that there are a small number of operators that have chosen not to offer the update to their users," the mail stated.

It is important to recognize that this decision was made solely by the operator and these include the T-Mobile network in the United States."

This is bad news for the 710 users who were looking forward to the update that would offer them a host of new features that arrive with the Windows Phone 7.8 update, especially the popular new Live Tiles feature.

"That's certainly a bit of a kick from T-Mobile, though we suppose with the carrier cost of testing the update and the perceived benefit, they decided against it," WPCentral states. And although we don't have a similar confirmation for the HTC Radar, we have a feeling that device will suffer the same fate."

However, users still willing to get the Windows Phone 7.8-based features can easily opt to manually install the update via CAB files. Although the process is a bit complicated, the update will successfully upgrade the OS up through Tango to Windows Phone 7.8, and bringing all the WP7.8 features along with it.

As far as the Windows Phone 7.8 is concerned, Nokia had previously confirmed that the updated operating system had already started shipping pre-loaded on its Nokia Lumia 510 device, along with other phones belonging to the Lumia family. For the owners of the Lumia 510, 610, 710, 800, and 900 model phones, however, the update notifications would appear soon.