[Perla V]

The phone would be used for business.

[Cody A]

It depends on your location but for the most part I've found AT&T to be more effective service-wise. As for the phone, the blackberry would be a better choice for business.

[hopelesromantc91]

T-Mobile, it seems, has less expensive minute plans, and I think they allow 1,000 characters per text, where AT&T has only 450. However, AT&T, I've been told, has the fastest data transfer rates, as well as the least expensive data transfer charges. So if you're looking at a Smartphone/PDA phone, I'd say AT&T. They also have better national service than T-Mobile.Go with the Blackjack 2. It's Windows Mobile based, which is the best mobile OS (arguably OS X Compress [iPhone] is better, but less functional). Windows Mobile has the most 3rd-party apps. and is much more customizable. If you're running Windows OS on your desktop/laptop, then definitely go with the Blackjack 2. It's interface is less restricted. It's seen almost as an additional drive, rather than just a phone with special software needed to interface with your computer. Windows Mobile with Windows on your desktop. If you're running a Mac or Linux, I don't know if ActiveSync is made for those operating systems. But, if you can, I'd say Blackjack 2: Best mobile OS.For business, deffinitely Blackjack 2. Blackberry OS doesn't have any Microsoft Office products in existance, but the BlackBerry comes with Office Mobile.