The Phone supports two GSM SIM at a time. If there is a call on one SIM then second SIM will be inactive during the call and vice versa. K1s has a 4.5 cm bright screen to enhance the overall experience for the users. K1s come with strong 1050mAh battery which makes your entertainment lasts long. Now No need to carry a Bulky Hand Torch, Your Karbonn K1s has torch that helps you to find your Way. Search & browse your favourite websites on the go by your K1s's inbuilt browser as it is GPRS enabled. Change your phone's Language to Hindi as per your convenience as your phone supports Hindi strings too.