We can set, which apps are allowed to use your mobile data in the background or is allowed to use the internet while roaming is on.

Note: If you deactivate background data for messenger apps like for example WhatsApp, you will receive your messages later or no messages at all.

Android 10 (EMUI 10.0)
Step 1:  Open the  settings
Step 2:  Tap on  Mobile network
Step 3:  Tap on  Data usage
Step 4:  Tap on  Network access
Step 5:  Open the  menu
Step 6:  Tap on  Advanced network settings
Step 7:  Activate or deactivate  background/roaming data  for the apps you want to restrict
  1. Open the settings
  2. Tap on Mobile network
  3. Tap on Data usage
  4. Tap on Network access
  5. Open the menu
  6. Tap on Advanced network settings
  7. Activate or deactivate background/roaming data for the apps you want to restrict

Huawei Instructions
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