It's not cheap, but if you're looking for a BlackBerry slider on T-Mobile, the Torch 9810 is the only game in town. The BlackBerry 7-equipped phone — previously launched on AT&T — will retail for $249.99 on contract after a $50 mail-in rebate, and it'll be made available on November 9th in stores and online. The carrier's business customers (the main target demographic for this phone, naturally) can pre-order beginning today.