I dropped in at T-Mobile today after (as expected) being less than impressed by the Pixel announcement.
Hadn't planned on it, but ended up leaving 30 minutes later having ordered the FE for $700 billed in equipment installments over 24 months, and with $700 in credits, credited monthly over the same term, no new service needed.
$500 from a trade-in value on my Pixel 3 XL and $200 from an Insider code. Providing I keep with Tmobile for 24 months (been with them or companies they've absorbed) over 20 years, so not even a doubt), my effective cost was $84 for taxes and some ridiculous nominal processing charge and then a swap of phones.
The trade-in credit is a heck of a deal, and applies for phones as old as the OnePlus6.