Yezz C21A - Unlocked Dual SIM Cell Phone (Red) A practical and thin design for those who want to stay communicated anywhere The C21 is a feature phone that allows you to be always connected thanks to its compatibility with 2G networks, GPRS and Bluetooth version 2.0. It has a 1.8-inch screen with QQVGA technology and a 600mAh battery. The entertainment never ends with the FM radio and expandable memory up to 8GB to store all you want.