Sony-Ericsson has come out with a lot of wonderful phones which will be a competition to other leading cell phone manufacturers. These phones come equipped with a lot of features that a customer will find very useful. The Sony Ericsson Z550 is a clamshell phone. The phone looks very clean and intelligent as well. It is made of an aluminum surface with a great elegance. The Sony-Ericsson Z550 is very slim and not bulky unlike the other clam shell phones in the market. Thus it will fit perfectly in any pockets.