RIM updates its Curve line with three new smartphone models running BlackBerry 7 OS, including the Curve 9350, Curve 9360 and Curve 9370. These mid-range devices are affordable, easy-to-use, full-featured and socially-connected. They has slim, stylish design and are ergonomically designed.     The main differences of the three models are the networks they supported and storage. The Curve 9350 supports dual-band CDMA/EVDO Rev A network while the Curve 9360 works on quad-band GSM/EDGE and tri-band UMTS 3G network. They has 512MB RAM and 512MB internal storage. The Curve