The T-Mobile network has never been more powerful. That's why they're letting you take the network built for data for a spin with unlimited calls, texts, posts, likes, streams, and downloads - free for 7 days. Then decide for yourself. They'll send you an iPhone 5s with iOS 8. Take 7 days to see what the fastest nationwide 4G LTE network can do. Return the iPhone 5s to your nearest T-Mobile retail store.