Microsoft details Windows Phone Tango update for existing devices

Microsoft is now listing the Windows Phone Tango update for existing devices on its OS update history page. The page now lists Build 8773.98, which is shipping on the European variant of the Nokia Lumia 900. This update brings some minor tweaks to the table such as messaging, and SIM card contact.
Microsoft is yet to reveal when the update will hit existing devices, but we can expect it to be released soon enough considering it is now being listed on the OS update page.
Windows Phone Tango was primarily designed to lower the hardware requirements for Windows Phone devices, so that lower cost handsets could be designed for developing markets. As of now, only the Nokia Lumia 610 makes use of these lowered hardware requirements.