This product is definitely outdated by today's technology levels. However, for a business person on the move this product had the most thoughtful set of features I could find at that time in a phone. I had 2 years of absolutely trouble free superb service from this phone. One of the features I liked the most was the ability to create specialized lists of contacts from whom alone, the phone would allow calls called the "accepted calls" list. This feature is extremely useful to people who spend a lot of time in meetings and run projects. This product convinced me that in many ways symbion OS is far more stable than even MS-mobile OS. If not for the fact that it is bulky and out of date today, I would still buy this phone. Sony ericsson took a definite step backward in features when it went to X1 after this phone. THIS WAS AND IS A MATURE PHONE.