I am using InFocus M810 on Reliance CDMA since Diwali along with iPhone 6 Plus 128 GB on Airtel 4G.
Both works just fine, no heating. InFocus is put in a Mercury diary case. I have torrents running on Infocus M810 all around the clock because I am on Magic 1300 plan with 50% ort in discount, Downloaded above 25 GB in 9 days and it has worked fine. The problem I face is sometimes the touchscreen's lower 3/5 portion stops registering touches. Have to shut down and restart it manually but I think that is because of Nova Launcher. GPS lock is also somewhat slow. Yes there is some risk in online purchase but then it is more of a portable internet device for me. All important calling is done on iPhone. Your options are"
- HTC 728G
- Gionee Marathon M5
Both are currently above 17,000 mark though. Otherwise you are limited to Lava device which was mentioned above but comes with android 4.x which is ancient now.