Settings > General > Background App Refresh
Select Off
Settings > Accessibility > Motion
Turn On Reduce Motion Turn Off Auto-Play Message Effects Turn Off Auto-Play Video Previews
Settings > Privacy > Location Services > System Services
Turn Off Location-Based Alerts Turn Off Location-Based Suggestions Turn Off iPhone Analytics Turn Off Popular Near Me Turn Off Routing & Traffic
Settings > Siri & Search
Turn Off Suggestions in Search Turn Off Suggestions in Look Up Turn Off Suggestions in Lock Screen