I am using lumia 520 and whenever I turn on data connection in it, within 10 secs about 1000kb get used up?

[Ne Win Thowai]

Find the apps that are making that much of a data. Mostly Social apps like facebook and twitter downloads different things on your phone to keep you close to your friends, it doesn't matter if you're on 3G or 2G, it's your smartphone. Smartphone these days cause a lot of troubles on data thing. Your internet connection is 37Kbyte/Sec, then in 10 sec it can go upto 400Kbyte or more. So in my opinion go and connect it to a WiFi, i know it will download necessary updates. So go to windows store app and turn off auto update and any backup/cloud service, OS/Windows update service. Turn all the internet connecting apps off on your WiFi then you can browse peacefully, but keep in mind that you should update your smartphone.