Android 15 has a secret weapon called Private Space that completely freezes apps when you're not using them. This is much more aggressive than regular app restrictions.
Setup steps: Go to Settings → Security & Privacy → Private Space → Set Up. Create a separate password (don't use your main device lock). Install all your data-hungry apps (Instagram, TikTok, Facebook) in Private Space only. Delete them from your main profile. When you lock Private Space, these apps completely stop using data - no notifications, no background refresh, nothing.
Pro tip: Set Private Space to auto-lock after 5 minutes. In your main profile, go to Settings → Apps → Show system apps → Private Space → Restrict background data. This creates a double lock on data usage.
Impact: Apps in Private Space use zero data when locked, compared to regular apps that still sync in the background. Users report 30-50% total data savings.
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