T-Mobile’s best-selling device of all time is a phone that has only been available for a few months.  A tweet from the nation’s fourth-largest carrier from over the weekend indicates that the Samsung Galaxy S III is doing quite well around Magenta’s neck of the woods.

Did you know the Samsung Galaxy S III is @tmobile‘s all-time best-selling device? RT if you love your device!

— T-Mobile USA (@TMobile) October 6, 2012

While this is certainly good news for T-Mobile, it’s also promising for Samsung, and Android, as well.  Consider that the handset has already done better than the G1, or any model of myTouch, or SideKick ever did in their entire run. Fantastic, no? With a good 6-9 months left before T-Mobile gets rid of this handset, T-Mobile will have set the bar high with Samsung’s flagship when it goes away.