The Phone supports GSM and CDMA SIM at a time. If there is a call on one SIM then second SIM will be active & call be received on second SIM & vice versa. KC520 is backed by 1500 mAh Battery, which makes your entertainment lasts long. KC520 has a big 5.6 cm bright screen to enhance the overall experience for the users. Now capture every special moment of your life with a high resolution 1.3 Mega Pixel Camera.