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Connectivity
The Z550i falls behind when it comes to the connectivity options of the phone. The Z550i just has a simple v1.1 Bluetooth and USB via the pop-port. The Nokia races ahead with added connectivity of Infrared, HSCSD, and EDGE. The Z550i has only GPRS for browsing; it is a Class 10 GPRS so don't put your hopes down but nevertheless it won't be as fast as EDGE. The pop-port USB connection is slow as pop-ports only support USB 1.1. The USB Cable is not provided along with the phone, you have to purchase it as an accessory.

Interface
The Z550i has the new Sony Ericsson interface, which is very smart. This same operating software is seen in most of the new phones released by the company. The phone has a 5-way D-Pad, which helps navigating through the menus easily. The menus are very smooth and the bubbling icons whenever highlighted look good. Filling up the internal memory of the phone will call for a slight decrease in the load times of the sub-menus.
But then that's the case with all the phones. There is the alternative way of navigating through the menus seen in all east-side phones; the keypad. Once you get used to navigating through the menus using the keypad, you will prefer it over the D-Pad. The themes of the phone are animated and the moving image on the main screen looks good.
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