Lumia 930 sports a 5 inch full-HD AMOLED display with quad-core Snapdragon 800 chipset and 2 GB RAM. Lumia 930 lacks an external memory slot  but features a 32 GB non-expandable memory. Packed with a 20 MP rear snapper and a 1.2 MP front camera, the smartphone offer 4G/3G/2G options.

On the other hand, Lumia 830 has a 10 MP camera wth Carl Zeiss optic. Powered by a 1.2GHz Snapdragon quad-core processor with 1GB RAM,  the smartphone has  16GB internal storage.

The flagship 830 will come with Windows Phone 8.1 with Lumia Denim operating system, 1 GB RAM, 16 GB internal user memory (15 GB OneDrive cloud storage and up to 128 GB micro SD card). It has a 5-inch display, 1.2 GHz quad-core processor, 10 MP camera and 2,200 mAh removable battery.
The Lumia 730 has a quad-core 1.2 GHz processor with 1 GB of RAM and 4.7-inch display. It has a rear camera of 6.7 MP, along with a 5 MP front-facing camera.
With 8 GB internal memory, the handset supports 15 GB OneDrive cloud storage and up to 128 GB micro SD cards.