At yesterday’s big reveal of the new — ooh, ahh — iPhone 6S, Apple estimated that the standard 24-month installment plan for one of these new phones would run around $27/month. Apple itself is launching a new offering at $32/month with the ability to upgrade every year. This morning, T-Mobile raised the big “give us a try” flag by saying it will sell the iPhone 6S for only $20/month. [More]