Unable to use mobile data for WhatsApp , miui browser , and email. topic

I'm unable to surf internet on my mobile browser using mobile data on my mi3. I'm using miui 6 stable china wcdma version. I'm even not able to connect to whatsapp and also email (in miui).I'm able to use my mobile data in other apps like playstore,dolphin browser, google installer and also in mi market also.. please help me to solve this. I can run all the apps when connected to a wifi even whatsapp , mi browser , email ..