Assuming your credit is good (yes, there's now a credit check involved if you want to buy a new phone or plan from the carrier), T-Mobile will ask you to pay $100 for the iPhone 5 up front.

T-Mobile announced earlier this week that it will offer the iPhone 5 for the first time ever next month. The company revealed that the 16GB model will cost $99 down and $20 a month for 24 months ...