Samsung Galaxy Note 2
While the Galaxy S3 will feature a new model for LTE purposes, the Galaxy Note 2 on T-Mobile will only need a software upgrade to enable 4G LTE data speeds. That alone makes it an extremely attractive option for T-Mobile customers.
Read: Samsung Galaxy Note 2 Review.
Helping is the fact that the Galaxy Note 2 features a massive 5.5-inch display, which makes it great for productivity, and it also comes with a quad-core processor, 8MP camera, and Android 4.1 Jelly Bean which makes it an extremely current smartphone.
Its price is a bit steep through T-Mobile but for many, the cost will be worth it.