Walton C1 and Walton D1 are cheapest among the smartphones by Walton mobile. The first one is priced only 4,990 TK and the later priced 6,490 TK. No doubt Walton D1 is much better than the previous one. It is in fact a 3g capable phone. Though the RAM is not more than 256MB. But for a very tight budget you certainly have to make some compromises. You will even get a secondary camera in it, if you want video calling. This handset has gps navigation. What else you expect for this price. Have a look at the specs if you want to buy one.