A major point that you must consider while buying a mobile phone is your future needs. If you simply buy a handset matching your current usages, then after a while you will find it redundant. Also, with technology changing at a rapid pace, you may end up having an outdated smartphone.
Thus we at The Mobile Indian have been advocating users to opt for a smartphone with 4G (LTE) capability. True, right now 4G services are almost non-existent in India but there is no doubt that within this year or next, the fourth generation services are likely to be in place atleast in most major cities. Ofcourse, if you are one of those rich folks who tend to change their mobile phones every six months or so, and/or if you don’t want fast data connectivity, then this article should not bother you at all.
The Lenovo A6000 is one of the second cheapest 4G smartphone after Xolo LT900 which is just couple of grands cheaper than this. The Lenovo A6000 comes with a 5 inch HD IPS display with a Pixel density of 294 ppi. This Android KitKat smartphone has Lenovo’s customised Vibe 2.0 user interface and runs on a quad-core processing unit clocked at 1.2 GHz with the help of 1 GB of RAM.
In the A6000 you will get 8 GB of internal storage and you can use a micro SD card of up to 32 GB in its expandable storage slot. Its 8 megapixel primary camera is equipped with face detection, auto-focus, HDR, flash, etc. For selfies and video calls, it comes armed with a 2 megapixel fixed focus camera in the front. Besides, the Lenovo A6000 has 4G, GPS, Bluetooth 4.0, WiFi, and a 2300 mAh battery that can provide up to 22 hours of Talk time or 264 hours of standby.
It is the successor of Lenovo A6000 and was released earlier this week. The A7000 has a 5.5 inch IPS display with a Resolution of 720 x 1280 pixels. With the latest Android Lollipop operating system, 1.5 GHz octa-core Processor and 2 GB RAM, it promises an ultra-smooth performance. The A7000 has decent 8 GB internal memory, to which you can add another 32 GB via a microSD card.
The A7000 has an 8 megapixel primary camera and a 5 megapixel secondary camera. The Dual-SIM 4G enabled phone also has GPS, Bluetooth, and WiFi. The 2900 mAh battery can provide up to 39 hours of talk time or up to 264 hours of standby.
###PAGE###
The Yu Yureka is one of the most sought after phones in the sub-Rs 10,000 segment. It has a 5.5 inch IPS display, with a pixel density of 267 ppi. The Yu Yureka comes with Android KitKat (4.4) based Cyanogen Mod OS 11. For those of you not in the know, Cyanogen is an extremely customisable Android based OS. The processing capability of the Yureka, is extremely high, as it has a octa core 1.5 GHz processor with 64-bit architecture and 2 GB of RAM. The Internal Memory is 16 GB, which is expandable by a further 32 GB via a micro-SD card.
The primary camera of the Yu Yureka is a 13 megapixel unit with 5P lens, Sony Exmor Sensor, f/2.2 aperture, flash, and video recording at 1080p at 30 fps, or slow motion at 720p at 60 fps. In the front of the Yu Yureka there is a 5 megapixel camera with Omnivision sensor and 4P lenses. This dual-SIM device has 4G, WiFi, Bluetooth, and GPS. Its 2500 mAh battery can provide up to 8 hours of talk time or 210 hours of standby.
The successor to the wildly popular Redmi 1s, is the Xiaomi Redmi 2. It has a 4.7 inch HD IPS display with a resolution of 720 x 1280 pixels. The phone runs on Android KitKat, with MiUI 6.0. It has a quad-core Snapdragon 410 processing unit with 1 GB of RAM. The internal memory stands at 8 GB, to which you can add an additional 32 GB via a microSD card. 
The primary camera is an 8 megapixel while in the front it has a 2 megapixel camera which can record videos at 720p. The Xiaomi Redmi 2 is a dual-SIM phone with 4G, GPS, WiFi, WiFi Hotspot, and Bluetooth 4.0. Power is provided by a 2200 mAh battery.
Microsoft Lumia 638 – Rs 6,799
The Microsoft Lumia 638 has a 4.5 inch IPS display with 221 ppi pixel density. The Windows 8.1 device has a quad-core 1.2 GHz processing unit that runs on 1 GB of RAM. The internal memory stands at 8 GB, which can be expanded by another 128 GB if needed. Its 5 megapixel camera has geo-tagging, auto-focus, Aperture of F/2.4, and 28 mm in focal length. Unfortunately it lacks a flash and even a front camera. This dual-SIM smartphone has 4G, GPS, Bluetooth 4.0, WiFi, etc. 
There is an 1830 mAh battery in the Lumia 638 that claims to provide 19 hours of talk time or 480 hours of standby.