Micromax Viva A72 solves this problem, now this phone is powered by 1GHz Processor (exact make and model number is mentioned yet) and has 256 MB RAM. It has 110 MB of internal storage (which is mainly available for the installation of applications) and it can be extended up to 32GB with the help of external memory slot (wherein you can store your eBooks and videos). The operating system in this phone is pretty old which Gingerbread (Android v2.3.6) is. You can see that all the specs mentioned above have never been equipped with a 5-inch screen and this is the best about this phone.
Availability and Pricing [ Buy Now Link At The End]
The main concern about this phone is the battery which is 2000mAh (adequate for the phone with such specs) and can provide the talk-time of 7 hours and the stand-by time of 280 hrs. The primary camera used is of 5MP and the secondary camera is a VGA camera of 0.3MP. As of now we do not have any idea about the release date and price of this phone we can expect it to be nearly 5000INR and thus it will be the cheapest 5-inch screen phone available in the mobile phone stores and the cheapest phone in the Canvas series by Micromax. You can keep a check on the shipping details and availability of Micromax Canvas Viva A72 on Flipkart at this page. You can buy it at the price of 6,999 INR from Snapdeal and Infibeam.