Tech and Memory
The Sony Ericsson K550i is a Quadband GSM phone. With regards to connectivity it's right up there with any other in its class. It's equipped with EDGE for quick connectivity to the net and it has Infrared, and Bluetooth (2.0) capabilities. Since it also has A2DP compatibility you can use a Bluetooth wireless headset for music or making and taking calls. That works out just fine. Another great feature is that you can directly blog your images using GPRS or EDGE, so images can be shared easily.
The K550i comes with 64MB of internal memory but you can always add more using a Memory Stick (M2).
You can also use the PC suite software to back up important schedules and data and synchronize the phone with your PC.
Battery
The K550i has a standard Li-ion battery but I have to say I was pleasantly surprised that I managed to get almost a full 6 hours of battery life. The indicator was empty but I still managed to squeeze about 15 minutes of usage out of the phone. It lasted me for 2 days on a single charge. And lets just say my usage was not minimal. From talking pictures to using the internet and even listening to a little music and making calls here and there.
hi,it is very nice to use ,but the numpad is very small and difficult to manipulate as well as network covering is very sloweri think defect in antenna problem to connect 
