T-Mobile recently “outraged” BlackBerry’s CEO John Chen when the wireless provider emailed its BlackBerry customers, encouraging them to upgrade to an iPhone 5S with no money down. After an angry blog post by Chen, T-Mobile apologized for the email and offered BlackBerry owners a big-time trade-in credit if they wanted to upgrade their phones – $250 toward a new BlackBerry or $200 toward any other new phone. This move did lead to lots of upgrades – but didn’t lead to very many new BlackBerrys. The recently-ended promotion saw 15 times more BlackBerry trade-ins than usual, but 94 percent of those upgrades saw customers leave BlackBerry for another platform. Even with an extra $50 on the table to upgrade to a Q10 or Z10, nearly 19 out of every 20 upgrading BlackBerry owners decided to jump ship. Is this, once again, the beginning of the end for BlackBerry? Not quite. T-Mobile’s BlackBerry options are pretty slim, and Chen said his company would focus on AT&T and Verizon, where his company’s phones do much better.