For the first time ever, every major carrier in the US actually has smartphones worth buying, meaning you don't have to break up to get a good phone. Here's the best phones on each one, along with the best deals. All pricing shown is with a new 2-year contract, and some deals may be temporary.
The iPhone 3GS is the best overall smartphone you can buy. It's really that simple. Best user interface, best internet, best apps, best media support--the list goes on. Okay, not the best network, but nothing's perfect. $199
BlackBerry Bold 9700
I miss the original BlackBerry Bold's king-sized keyboard, but the Bold 9700 squeezes the best of the BlackBerry for CEOs into an impressively tight form factor--faux leather back included--making it very possibly the best BlackBerry you can buy. $10
Bonus: Nokia e71x
It's free, and an actually good smartphone--my favorite Nokia phone on the planet. Free
It's a terminator. A huge, disgustingly high-res screen, Batman-worthy industrial design, and the full power of Android 2.0 make it the best phone on Verizon--and the fact that it's running on arguably the best network in the US make it the second best smartphone you can buy, period. $150
Sure, it's notorious for trackball problems and it's missing Wi-Fi, but this is the BlackBerry of choice for email warriors if they're not on AT&T or T-Mobile and it sure as hell beats anything running Windows Mobile. $50
The Pre offers one of the best user experiences of any smartphone with Palm's webOS, and it's probably the best phone on Sprint, hardware build issues and comparatively dinky App Catalog aside. $80
The best Android phone not running Android 2.0, HTC's Sense UI makes the sometimes confusing Android interface more digestible and has a few nifty tricks of its own, like integrated social networking. $100
Motorola's other Android phone is gussied up with Blur, a custom interface that's bright and friendly, with widgets for keeping track of everything happening on your social network. It's our favorite Android phone on T-Mobile. $100
No, I'm not kidding. A jailbroken and unlocked iPhone, even without 3G powers, is the second best smartphone you can use on T-Mobile.