Microsoft Lumia 540 dual SIM is the best Microsoft smartphone under 10, 000 and this phone has good battery backup. The operating system of this phone is windows 8.1 with Lumia Denim. It has capacitive LCD 5 inch display. This phone is built with 1GB RAM and 8GB ROM. It has 8MP back camera with f/2.2 aperture and front camera is of 5MP. This phone is the product of Microsoft and it uses less data and conserve less battery. The standby of this phone is up-to 576 hours in 2G.It has dedicated slot of micro SD which supports up-to 256GB. In short, this phone is awesome.