Samsung SGH-X640S OS: Samsung; Internal memory: 100 MB; Primary display: UFB 160 x 128 pixels 65K colors QQVGA; Memory Card: No; Primary camera: 0.3 MP 640 x 480 pixels VGA; Secondary camera: No; Headphone: No; WI-FI: No; NFC: No; GPS: No; Bluetooth: No; HDMI: No; Hot...