Restrict for specific apps indefinitely
1. Go to Settings > Network & internet > Mobile network.
2. If you're using two SIMs, tap the SIM name.
3. Tap App data usage.
4.
Tap an app, then turn Background data off  .
Dual SIMs
If your phone has two SIMs, cellular data is active on only one SIM at a time. You can control which SIM is 
used.
Settings : Network and internet 164