I have had my Sony Ericsson w850i phone for nearly two years now and I have no intention of changing any time soon. It has been by far my most reliable mobile phone to date. The sliding mechanism on the phone hides keys that are less regularly used and quickly locks and unlocks the keypad. The mp3 player is really simple to use. The controls being on the front of the phone with a large screen displaying the tracks playing. The camera is of fairly low quality compared to a lot of digital cameras available at the moment but it is easy to use and retrieve photos. Photo transfer to pc is very straight forward. The only drawbacks to this phone is that it is a little bulky and the memory card has a small amount of memory if you are to use all of the multimedia functions on the phone. These however can be easily purchased in a bigger size.