Key features:
* 2.6" 262K-color TFT display of QVGA resolution
* 3G with HSDPA
* Trackball navigation
* Built-in GPS receiver
* Symbian OS with S60 user interface
* Wi-Fi (Samsung i550w only)
* 3 megapixel camera with auto focus
* MicroSD card slot
* 3.5mm stereo audio jack
* FM radio
* Decent battery life
* Bluetooth with A2DP support
Main disadvantages:
* Tri-band GSM support only
* Trackball is somewhat slow
* No two-step shutter key
* No Wi-Fi (Samsung i550)
* A bit too conservative looks
* Video recoding limited to QVGA resolution
* Awkward soft key layout
* No RDS
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Samsung i550 - Full phone specifications