I have the T-630 variant (900-1800-1900) of this phone, which I bought unlocked in the Philippines and use here in the US on T-Mobile. What I really like is the attractive and intuitive software and user interface. Everything is logical and works well. The learning curve is not steep. It's sort of Macintosh-like in that way. I also have a Motorola, which has many of the same features, but you really have to work to figure out how to access and use them.The T-630/T-637 also syncs effortlessly with Macintosh calendar and address book through iSync and Bluetooth. This phone is quite small and convenient to take along with you. The engineering and build quality see excellent. The battery life is good and I like the included ring tones and system sounds.I have to agree with another reviewer that the camera is next to useless, but that's true of most inexpensive phones.The lacks one important feature --- or I have not been able to find it. It cannot be set to beep when there is an unread voicemail or text message. It's therefore easy to not realize that you have missed a call, unless you make a point to check the screen.