Few days ago I've reset factory settings on MEIZU m5. And moved to we4G provider.

The first day everything was OK. On the second day:

"No Data Plan Set. 100 MB used this month. (Ignore, Set Now)"

message appears every 20 -60 sec, which closes browser.

It appears for only few sec, so that it is impossible to react   and to touch (Ignore or Set Now).

Also warning appears when MEIZU m5  wakes up:

" Data usage warning. Touch to view usage and setting"

this message is stable , but doesn't react on touching.