Well, this is weird...
I placed my order for a 64GB silver 6 Plus at 6:34 AM last Friday, and immediately there was a pre-auth on my debit card for $192-something -- basically, the down payment, SIM starter kit, $24.99 for shipping and sales tax). That charge, naturally, disappeared by Monday or so.
I check order status, but as I'm not an existing T-Mobile customer, I don't have access to the "My T-Mobile" thing, so I think the order status is a little less informative. It has the order date, but no mention of ship date or backorder status or anything useful.
That hasn't changed as of this morning, but now there's a new charge on my debit card from T-Mobile. This one, however is for $37 less than the initial pre-auth. I'm trying to figure out the discrepancy, but coming up short. Even if they removed the $24.99 shipping charge, sales tax isn't that high.
Watch... in a month when my order finally ships, it'll be the wrong phone. Hahaha.