Windows Phone generally performs well on even lower-end devices, the Lumia 520 showed us that. But the Canvas Win W121 is not one of those devices. Windows Phone 8 stutters on the Canvas Win 121, web browsing is slow and even with a 8MP rear camera it can only record 480p videos. Even video playback stutters and it heats up in gaming. You should give this one a miss.
6.4
The Micromax Canvas Win W121 makes even Windows Phone look sluggish, web-browsing stutters, games don't run well and watching videos is a pain.