Sprint arguably had the best version of the Samsung Galaxy S II. Sprint's model, the Samsung Epic 4G Touch, had the same 4.52 inch screen as the T-Mobile version offered, but the Sprint model was powered by dual-core Exynos processors which are considered a cut above the dual-core Qualcomm Snapdragon chps found on the T-Mobile model. And while the AT&T unit had the same Exynos processor, that model offered a smaller 4.3 inch display.
This year, with all four of the major U.S. carriers offering the phone, one difference is that T-Mobile's model won't have an LTE radio. While that seems to make sense considering the carrier has no LTE network, some customers of the nation's fourth largest carrier had hoped that the device would be ready for LTE as soon as T-Mobile turns on its network in 2013. Instead, T-Mobile's version of the Samsung Galaxy S III will run over the carrier's zippy HSPA+ 42Mbps network. How fast is that pipeline? In a recent test it beat out Verizon's LTE network speed in 11 cities.
Returning to different variants of the T-Mobile Samsung Galaxy S III in the States, AT&T will not be offering a 32GB model and instead has promoted the use of a 16GB microSD card to make up most of the difference. In return for not having a 32GB model of the phone to sell, AT&T will get an exclusive red color of the Samsung Galaxy S III to offer its customers.