BUY.
The good: The HTC One S manages to pack Android ICS, Sense 4, and a feature-filled camera into one of the slimmest phones on the market.
The bad: The One S' svelteness comes at the cost of no SD card expansion slot or removable battery.
The bottom line: The HTC One S is the best phone you can get on T-Mobile (for now), wrapping Android 4.0, 4G data speeds, and a beautiful 4.3-inch AMOLED screen into one svelte package.