How to prevent any data connections/transmissions over mobile phone provider

I have a Sony Xperia Z1 compact D5503 Build 14.6.A.1.236.

I do not want to have any network traffic(TCP/IP) going via mobile network 2G, 3G and/or 4G. For this I deactivated whole month January 2016 "Mobile data transmission" and restricted completely all "background data transmissions" in Android.

Despite this my mobile phone provider has listed several connections and transmissions of data 20KB each for January 2016.

How to prevent any data transmissions over mobile 2G/3G/4G?
How to know what caused this traffic?

Rgds
AW

Show Accepted Answer

Guest Quick Reply (No URL, BBcode or HTML)

Last post by herman.braxton
2 hours ago
Last post by mosciski.kip
2 hours ago
Last post by nellie.ortiz
1 hour ago
Last post by reinger.jenifer
4 hours ago
Last post by mateo36
26 minutes ago
Last post by ybeer
2 hours ago
Last post by rath.elizabeth
1 hour ago
Last post by hheaney
3 hours ago
Last post by wschuster
4 hours ago
Last post by layla54
42 minutes ago
Last post by jonathon.emard
48 minutes ago