find which app sync data in roaming

i am facing some issue in Nexus 5.

In my phone some apps that used Mobile-Network for syncing the data in background but i don't know. Every 1 hour message is coming with data usage. But i don't know which app used this. Every time my Balance is cutting up.

So is there any way to find which app is running in roaming?

any application in Market.

please i need any suggestion thnx.