T-Mobile late last week revealed on its Twitter page that the Galaxy S III has become the carrier’s best selling device of all-time. The smartphone has found a place in the company’s record book after being released less than fourth months ago. We are left wondering, however, if the milestone would be different had T-Mobile offered the iPhone. Samsung’s (005930) flagship smartphone has seen near universal praise and achieved high sales so far, and the South Korean manufacturer has sold more than 20 million Galaxy S III smartphones as of September and expects to top 30 million units by the end of the year.