Candybar phones are so last year -- if you want to keep up with the mobile phone fashionistas, you need to swap that block for a phone that slides. Slider phones are this year's must-have and aside from being a change in form factor, there are also some advantages to having a phone that slides open and shut.
For example, you can start and stop a call without even having to look at the screen or press a button, by simply sliding it open or shut. Slider phones are also more compact, because they don't need to house everything on one section, and can also have larger screens. We think they look pretty good, but that's just our two penn'orth -- you can make up your own mind about that one.
Things you might want to look for include a smooth slide mechanism that stays shut when you want it to and won't move around in your pocket. You should also check how much functionality the phone provides with the slide shut -- it's handy to be able to access key features quickly without sliding the phone open. Another thing to check is the location of the camera. If it's situated behind the front section of the phone, it will be protected by the bottom section. If not, it will be open to the elements, unless it has a dedicated cover.
Finally, make sure that you don't sacrifice style over substance. Make sure the phone provides all the features you need before you make your final decision.