If you've been carrying around a Lumia 710 for T-Mobile in your pocket and waiting for the day when you'd get a taste of Tango (Windows Phone 7.5 Refresh), you'll be happy to know that it could very soon. An internal memo passed along to WPCentral has Microsoft delivering the update on June 20th. Much like you'd hope, it should switch on hotspot support to share that HSPA+ network with others; many of the fixes between Mango and Tango will have snuck their way in as well, such as the cure for the well-known disappearing keyboard bug. Assuming the schedule holds, about the only visible drawback might come from a staggered rollout that won't have everyone dancing until July 31st.
Microsoft Windows Phone 8.1
Microsoft Windows Phone 7.5