Some people who own a G1 on the TMobile network may notice a update, here’s what a TMobile Rep had to say:
We are aware some T-Mobile G1 and T-Mobile myTouch 3G customers have received an over-the-air update. It was sent to a small, controlled pilot and is not yet available to all customers. The update (DMD64) is intended to improve the phone’s call performance and is NOT Éclair.
We will post updates to these Forums with more information when the software upgrade is available to all T-Mobile G1 and T-Mobile myTouch 3G customers.
This has no noticeable GUI changes, mainly changes to the call quality.
Have you received the update? Tell us what it changed on your phone in the comments.
Source:TMobile forums