# SilverMetal — Android

**Status**: Phase 2 (planning, post-Linux v1)

Android coverage spans **both** SilverMetal product lines:

- 🔒 **SilverMetal OS** for devices where we ship a custom ROM (Pixel, Samsung-unlocked, Motorola-unlocked)
- 🛡️ **SilverMetal Enhanced** for users keeping their existing Android (any vendor, no bootloader unlock required)

See [`../docs/platform-matrix.md`](../docs/platform-matrix.md) for honest per-tier pros/cons.

## Sub-flavours

### 🔒 SilverMetal OS — Pixel (Tier B)
GrapheneOS-fork on Pixel hardware. Verified boot we control, hardened kernel, app sandboxing enforced. Full SilverLABS Stack preinstalled. **Phase 2.1.**

### 🔒 SilverMetal OS — Samsung (Tier C)
LineageOS / DivestOS-fork on Samsung models with unlockable bootloaders. **Phase 2.2.**

### 🔒 SilverMetal OS — Motorola (Tier C)
DivestOS / LineageOS-fork on supported Motorola models. **Phase 2.3.**

### 🛡️ SilverMetal Enhanced — Android (Tier D)
For users keeping their existing OEM Android (Samsung locked-bootloader, OnePlus, Xiaomi, hand-me-downs, etc.). Stack apps + work-profile-based hardening config; no bootloader changes, no warranty void. **Phase 3A.**

## Directory layout

To be populated as each sub-flavour is built. Initial structure planned:

```
android/
├── os-pixel/        # 🔒 GrapheneOS-fork build config (Phase 2.1)
├── os-samsung/      # 🔒 Samsung ROM build configs (Phase 2.2)
├── os-motorola/     # 🔒 Motorola ROM build configs (Phase 2.3)
├── enhanced/        # 🛡️ Generic profile installer + work-profile config (Phase 3A)
└── shared/          # Common build infra, signing, OTA
```

## Verification gates

- **OS tiers**: verified boot rooted in our key (Pixel only); reproducible builds; OTA signed and rollback-tested
- **Enhanced tier**: Stack apps installed and functional; work-profile isolation verified; no bootloader changes detected
- **All tiers**: telemetry-leak test (no Google services contact unless explicitly opted in by user); SilverVPN integrated as default VPN

## Upstream we depend on

- **GrapheneOS** — Pixel OS base
- **LineageOS** — Samsung / Motorola OS base
- **DivestOS** — additional hardening patches
- **AOSP** — root upstream
- **`SilverLABS/SilverVPN`** — MAUI Android client (existing)

## Note on naming

The existing repo `SilverLABS/SilverDROID` (SilverSHELL AppStore Android client) is unrelated to this Android flavour despite the similar name. They serve different products.