Micromax canvas spark 4g has lot of problems. It has only 4g smartphone and nothing else is good in it.
It has only 1 GB of ram and having not so good ram management. Poor multi tasking. Not having quite big screen in it just only of 5 inches display only. Very low resolution display pixels of 854 by 480 px only and not very sharp screen resolution just only 194 PPI.
Its has only 8 GB of internal storage in which you can access less than 6 GB. And having quad core processor. And having low mega pixel camera of 5 mp back camera and 2 mp front Camera. The Design of smart phone not good and attractive looking.
Sound reception is low, while driving on vehicles the noise is not able to listen that someone calling you. Range of features is less. Like gyroscope sensor is missing in it.
And overhearting problem should be faced in it. It goes heated rapidly.
And this smartphone is not value for money smartphone.