T-Mobile never let on that its $99 down payment for the iPhone 5 was only a month long promotion, but according to Tmo News, all T-Mobile's iPhone 5 models will see a $50 price increase starting today. The monthly payments of $20 a month will stay the same, but the down payment is now $149. This means T-Mobile customers will pay $629 for the 16GB model over 24 months. An off-contract iPhone 5 costs $649 in comparison. So the iPhone 5 is still cheaper through T-Mobile, but you're getting a locked model, instead of an unlocked model.
The iPhone 5 now costs the same amount as the Galaxy S4, however, T-Mobile is still offering the HTC One for $99 down. HTC fans may want to take advantage of this deal before it also disappears.