The discount can be used one time only and is not good for devices priced under $100. The coupon code is offered to college students and teachers, and faculty working in grades K-12.
The coupon cannot be used for upgrades and must be employed for new services. This means that those adding a new line or opening a new account are eligible to use the code. The discount is available to use for online orders only.
T-Mobile offers a $48 coupon code to college students and teachers
source: T-Mobile via TmoNews