The Sony Ericsson K550 is a mid-range bar-style phone that features an M2 memory card slot, 2 megapixel auto-focus camera, stereo Bluetooth, EDGE data, and voice dialing. Other key features include photo caller ID and ringer ID, custom graphics, and custom ringtones.
Buying a replacement phone will not affect your existing service contract, but are generally more expensive, since they are not being discounted by your carrier.
More info...
Carrier Compatibility
Properly unlocked, this phone should be compatible with:
Centennial Wireless, Edge Wireless - Note! Always confirm compatibility before purchasing.
More info...