Hi. I have Samsung S9 plus and sometimes use it with a cellphone connection from overseas. While on international roaming, it costs me lots even if I use few kb of data, hence I turned the cellphone mobile data off (WiFi is on). I noticed on Samsung Galaxy S9 plus that even when mobile data data is off , the cell phone uses very little data especially when rebooting. After rebooting it does not consume cell data. On the other hand, I have Google Nexus 6P and it NEVER uses mobile data when mobile data is turned off, even while rebooting. I was wondering why the S9 plus "steals" some data especially when rebooting and Nexus 6P does not. Also, would appreicate an recommendation on any other Google or Samsung phone that will never use or steal data when mobile data is turned off, even while its rebooting. Thank you!