I have an Blackview BV 8000.
Some Apps like Chrome, Stack exchange, Facebook, WhatsApp... Work without a problem.
However apps like Gmail, YouTube and Google play store don't work on cellular data. I always get an error message, that tells me to check my internet connection (cellular or wlan/wifi, that I know is good).
In settings there is a network access control panel, where I unlocked those apps, however they still don't work under cellular data.