A leaked internal T-Mobile memo shows that the carrier will begin pushing out the Windows Phone Refresh (Tango) update for the Nokia Lumia 710 in two short days. Windows Phone update 7.10.8773 will begin rolling out on June 20 and will continue in a staggered fashion through July 31.

Users will be notified over the air and through Zune that an update is available. The memo describes the following fixes and improvements:

Enables tethering hotspot

Resolved keyboard disappearing

Resolved unlock screen getting stuck

Improvements to uplink speed

Improvements to camera quality

Improvements to proximity sensor

Improvements to software stability

The memo itself also states that Microsoft is responsible for pushing the update and that T-Mobile has no control over who gets notified when. So even if you are feeling antsy and try to call them, T-Mobile customer service will not be able to help you out.

Source: T-Mobile; Thanks, Jacinta, for the tip!