diff --git a/README.md b/README.md
index 6e973dd..1d72de5 100644
--- a/README.md
+++ b/README.md
@@ -130,3 +130,4 @@ Current baseline note: after common-platform workspace alignment, `pnpm install
 - [`docs/ROADMAP.md`](docs/ROADMAP.md) — Master execution tracker
 - [`docs/PRODUCTION_READINESS_HANDOFF_ROADMAP.md`](docs/PRODUCTION_READINESS_HANDOFF_ROADMAP.md) — Active production-readiness checklist
 - [`docs/PLATFORM_SMOKE_CHECKS.md`](docs/PLATFORM_SMOKE_CHECKS.md) — Shared platform and NoteLett smoke commands
+- [`docs/MOBILE_PRODUCTION_BUILD_AND_SMOKE.md`](docs/MOBILE_PRODUCTION_BUILD_AND_SMOKE.md) — Expo build notes and iOS/Android smoke checklist
diff --git a/docs/MOBILE_PRODUCTION_BUILD_AND_SMOKE.md b/docs/MOBILE_PRODUCTION_BUILD_AND_SMOKE.md
new file mode 100644
index 0000000..8a49496
--- /dev/null
+++ b/docs/MOBILE_PRODUCTION_BUILD_AND_SMOKE.md
@@ -0,0 +1,148 @@
+# NoteLett Mobile Production Build And Smoke Checklist
+
+Date: May 5, 2026
+Surface: Expo mobile app in `mobile/`
+
+## Scope
+
+This runbook covers the release-readiness checks for the NoteLett Expo companion app. It is intentionally focused on the current React Native/Expo path, not a native Swift/Kotlin track.
+
+## Product Identity
+
+The canonical product identity is `shared/product.json`.
+
+| Field | Value |
+| --- | --- |
+| Expo name | `NoteLett` |
+| Expo slug | `notelett` |
+| URL scheme | `notelett` |
+| iOS bundle identifier | `com.bytelyst.notelett` |
+| Android package | `com.notelett.app` |
+| Platform product id | `notelett` |
+
+Verify before a production build:
+
+```bash
+node -e "const app=require('./mobile/app.json').expo; const product=require('./shared/product.json'); console.log({name: app.name, slug: app.slug, scheme: app.scheme, ios: app.ios.bundleIdentifier, android: app.android.package, productId: product.productId})"
+```
+
+## Required Services
+
+Production-like smoke checks require these services to be reachable from the simulator/device:
+
+| Service | Default local URL | Purpose |
+| --- | --- | --- |
+| NoteLett backend | `http://localhost:4016/api` | Notes, workspaces, intake, prompts, reviews |
+| platform-service | `http://localhost:4003/api` | Auth, flags, kill switch, telemetry, diagnostics, blob |
+| extraction-service | `http://localhost:4005` | URL/task extraction behind backend flows |
+
+For physical devices, replace `localhost` with the host machine IP or a tunnel URL that the device can reach.
+
+## Build Environment
+
+Set mobile public API URLs before building or launching a production-like app:
+
+```bash
+export EXPO_PUBLIC_NOTES_API_URL="https://api.notelett.app/api"
+export EXPO_PUBLIC_PLATFORM_SERVICE_URL="https://platform.bytelyst.com/api"
+```
+
+Local simulator/device smoke can use LAN URLs:
+
+```bash
+export EXPO_PUBLIC_NOTES_API_URL="http://<host-lan-ip>:4016/api"
+export EXPO_PUBLIC_PLATFORM_SERVICE_URL="http://<host-lan-ip>:4003/api"
+```
+
+Do not put secrets in `EXPO_PUBLIC_*` variables. They are bundled into the app.
+
+## Pre-Build Verification
+
+From the repo root:
+
+```bash
+zsh -lc 'source ~/.zshrc; export GITEA_NPM_TOKEN; pnpm install --frozen-lockfile'
+zsh -lc 'source ~/.zshrc; export GITEA_NPM_TOKEN; pnpm --filter @notelett/mobile run typecheck'
+zsh -lc 'source ~/.zshrc; export GITEA_NPM_TOKEN; pnpm --filter @notelett/mobile run test'
+```
+
+If lint is part of the release gate, run it and compare against the known P0.5/P8.1 lint baseline:
+
+```bash
+zsh -lc 'source ~/.zshrc; export GITEA_NPM_TOKEN; pnpm --filter @notelett/mobile run lint'
+```
+
+## Local Production-Like Launch
+
+Start shared services and the NoteLett backend first. For an isolated product-backend check:
+
+```bash
+DB_PROVIDER=memory JWT_SECRET=dev-secret-do-not-use-in-prod pnpm --filter @notelett/backend run dev
+```
+
+Then launch the mobile app:
+
+```bash
+zsh -lc 'source ~/.zshrc; export GITEA_NPM_TOKEN; pnpm --filter @notelett/mobile run start'
+```
+
+Open the app in an iOS simulator, Android emulator, Expo Go, or a development build. For physical devices, confirm the `EXPO_PUBLIC_*` URLs are not `localhost`.
+
+## Production Build Notes
+
+The repo does not currently include an `eas.json`, so EAS build profiles must be added before CI-driven store builds. Until that lands, treat EAS as an operator step:
+
+```bash
+cd mobile
+eas build --platform ios --profile production
+eas build --platform android --profile production
+```
+
+Before running those commands:
+
+- Confirm Apple/Google signing credentials are configured in EAS.
+- Confirm `EXPO_PUBLIC_NOTES_API_URL` and `EXPO_PUBLIC_PLATFORM_SERVICE_URL` are set through EAS environment variables or the selected build profile.
+- Confirm `mobile/app.json` still has the production bundle identifiers listed above.
+- Confirm privacy and permission copy matches any native modules enabled for the build.
+
+## iOS Simulator Or Device Smoke
+
+Run this checklist on a production-like iOS build or simulator launch:
+
+- Open app cold and confirm the kill-switch gate does not appear when platform-service reports enabled.
+- Register a new account or sign in with a test platform-service account.
+- Force close and reopen; confirm auth state persists and stores hydrate only after auth bootstrap.
+- Toggle airplane mode before launch; confirm cached auth does not force logout and note list remains usable from local state where available.
+- Create a text note in Capture, then confirm it appears on Home and opens in note detail.
+- Edit the note title/body and confirm the update persists after reopening detail.
+- Switch workspaces on Home and Capture; confirm filters/save target update.
+- Submit URL intake from Capture or share intent; confirm queued state appears, success navigates to note detail, and failures show an error instead of spinning forever.
+- Run a Smart Action prompt from note detail; confirm success renders result and failure shows the prompt error state.
+- Approve and reject one inbox item with a review note.
+- Open Settings and submit feedback through the shared feedback client.
+- Background the app and return; confirm queued notes flush when online and telemetry flush does not crash.
+- Trigger or simulate broadcast/survey responses if available from platform-service.
+- Sign out and confirm protected tabs route back through auth.
+
+## Android Emulator Or Device Smoke
+
+Run the same workflow on Android, plus:
+
+- Confirm the Android package is `com.notelett.app`.
+- Confirm back navigation from auth, note detail, prompt result, and intake does not leave a blank route.
+- Confirm text inputs are not obscured by the keyboard in auth, capture, note detail, inbox review note, settings feedback, and intake screens.
+- Confirm Dynamic Type/accessibility font scaling keeps button text readable and unclipped.
+- Confirm physical-device builds use LAN/tunnel URLs, not `localhost`.
+
+## Result Recording
+
+Record smoke results with:
+
+- build identifier or simulator/device name
+- backend/platform/extraction URLs used
+- account tested
+- pass/fail for each checklist item
+- links to logs, screenshots, or crash reports for failures
+- commit hash under test
+
+P10 production gate should attach or summarize this record before release.
diff --git a/docs/roadmaps/04_MOBILE_ROADMAP.md b/docs/roadmaps/04_MOBILE_ROADMAP.md
index 33c469d..47c6c92 100644
--- a/docs/roadmaps/04_MOBILE_ROADMAP.md
+++ b/docs/roadmaps/04_MOBILE_ROADMAP.md
@@ -41,7 +41,7 @@ Stack: React Native + Expo + TypeScript
 
 # Phase M4 — Hardening
 
-- [ ] Smoke tests
+- [x] Smoke tests documented in [`../MOBILE_PRODUCTION_BUILD_AND_SMOKE.md`](../MOBILE_PRODUCTION_BUILD_AND_SMOKE.md)
 - [x] Error-state polish
 - [x] Build/compile verification
 - [x] Token compliance review
@@ -83,6 +83,7 @@ Stack: React Native + Expo + TypeScript
 - Mobile now uses token-backed placeholder and border colors instead of raw hardcoded fallbacks.
 - Expo now boots locally, and `tsconfig.json` was aligned to extend `expo/tsconfig.base`.
 - Mobile core Expo package versions were aligned to the SDK 55 expectations surfaced during runtime startup.
+- Expo production build notes and iOS/Android simulator/device smoke checklist now live in `docs/MOBILE_PRODUCTION_BUILD_AND_SMOKE.md`.
 - Mobile currently uses provisional product config, but the core quick-capture and note retrieval/edit slice is now wired to the product backend.
 - Quick capture now persists notes through the product backend instead of saving local-only drafts (`5995b6c`).
 - Quick capture now exposes live workspace selection directly on the capture screen (`8e57799`).