diff --git a/frontend/src/components/CustomAppFrame.vue b/frontend/src/components/CustomAppFrame.vue
index fdbd4d5..1139e6f 100644
--- a/frontend/src/components/CustomAppFrame.vue
+++ b/frontend/src/components/CustomAppFrame.vue
@@ -27,6 +27,12 @@ import {
   customAppLifecycleScheduler,
   getCustomAppSafeArea,
 } from '@/utils/customAppLifecycle'
+import {
+  createLbPhoneFrameDocument,
+  createLbPhoneHostSettings,
+  getLbPhoneCallbackResource,
+  usesLbPhoneHostRuntime,
+} from '@/utils/lbPhoneAppBridge'
 import { nuiCall } from '@/utils/nui'
 
 const props = defineProps<{
@@ -43,7 +49,9 @@ const frame = ref<HTMLIFrameElement | null>(null)
 const frameLoaded = ref(false)
 const frameUnavailable = ref(false)
 const skyBridgeReady = ref(false)
+const lbFrameDocument = ref<string | null>(null)
 let loadTimeout: ReturnType<typeof setTimeout> | undefined
+let frameDocumentController: AbortController | undefined
 const lifecycleAppId = props.app.id
 const initialOpenRequest: CustomAppOpenRequest | undefined =
   catalog.openRequests[lifecycleAppId]
@@ -94,11 +102,18 @@ const frameUrl = computed(() => {
   return url.href
 })
 const frameOrigin = computed(() => new URL(frameUrl.value).origin)
+const lbHostRuntime = computed(() => usesLbPhoneHostRuntime(props.app))
+const frameMountable = computed(
+  () => !lbHostRuntime.value || lbFrameDocument.value !== null,
+)
+const frameSource = computed(() =>
+  lbHostRuntime.value ? undefined : frameUrl.value,
+)
 const postMessageOrigin = computed(() =>
-  props.app.bundled ? '*' : frameOrigin.value,
+  props.app.bundled || lbHostRuntime.value ? '*' : frameOrigin.value,
 )
 const sandbox = computed(() =>
-  props.app.bundled
+  props.app.bundled || lbHostRuntime.value
     ? 'allow-downloads allow-forms allow-modals allow-scripts'
     : 'allow-downloads allow-forms allow-modals allow-same-origin allow-scripts',
 )
@@ -120,6 +135,15 @@ const context = computed<SkyPhoneAppContextV1>(() => ({
   protocolVersion: PROTOCOL_VERSION,
   safeArea: getCustomAppSafeArea(props.app.orientation),
 }))
+const lbSettings = computed(() =>
+  createLbPhoneHostSettings({
+    deviceName: phone.device?.name ?? '',
+    isDarkMode: phone.isDarkMode,
+    language: phone.lang,
+    preferences: phone.preferences,
+    securityEnabled: phone.security.enabled,
+  }),
+)
 
 function postToFrame(payload: unknown): boolean {
   const target = frame.value?.contentWindow
@@ -149,6 +173,44 @@ function sendContext(): void {
   })
 }
 
+function sendLbSettings(): void {
+  if (!lbHostRuntime.value || !frameLoaded.value) return
+  postToFrame({
+    settings: lbSettings.value,
+    type: 'sky-phone:lb-settings',
+  })
+}
+
+async function prepareLbFrameDocument(): Promise<void> {
+  const controller = new AbortController()
+  frameDocumentController = controller
+  try {
+    const response = await fetch(frameUrl.value, {
+      credentials: 'omit',
+      signal: controller.signal,
+    })
+    if (!response.ok) {
+      throw new Error(`${response.status} ${response.statusText}`)
+    }
+    const html = await response.text()
+    lbFrameDocument.value = createLbPhoneFrameDocument(html, {
+      appName: props.app.id,
+      resourceName: getLbPhoneCallbackResource(props.app),
+      settings: lbSettings.value,
+      ui: props.app.ui,
+    })
+  } catch (error) {
+    if (controller.signal.aborted) return
+    if (loadTimeout !== undefined) clearTimeout(loadTimeout)
+    loadTimeout = undefined
+    frameUnavailable.value = true
+    console.error(
+      `[Custom apps] Could not prepare LB Phone frame ${props.app.id}.`,
+      error,
+    )
+  }
+}
+
 function flushOpenRequest(): void {
   const request = catalog.openRequests[props.app.id]
   if (!request || !frameLoaded.value) return
@@ -216,7 +278,7 @@ async function handleBridgeRequest(
 
 function isTrustedFrameMessage(event: MessageEvent): boolean {
   if (event.source !== frame.value?.contentWindow) return false
-  if (props.app.bundled) {
+  if (props.app.bundled || lbHostRuntime.value) {
     return event.origin === 'null' || event.origin === frameOrigin.value
   }
   return event.origin === frameOrigin.value
@@ -272,6 +334,7 @@ function onFrameLoad(): void {
   )) {
     postToFrame(message)
   }
+  sendLbSettings()
   if (props.app.bridgeMode === 'legacy' || skyBridgeReady.value) {
     frameUnavailable.value = false
   }
@@ -300,16 +363,19 @@ onBeforeMount(() => {
       `[Custom apps] Frame readiness timed out for ${props.app.id}.`,
     )
   }, props.app.readyTimeoutMs)
+  if (lbHostRuntime.value) void prepareLbFrameDocument()
 })
 
 onBeforeUnmount(() => {
   if (loadTimeout !== undefined) clearTimeout(loadTimeout)
+  frameDocumentController?.abort()
   window.removeEventListener('message', onFrameMessage)
   orientation.release()
   void lifecycle.report('close')
 })
 
 watch(context, sendContext, { deep: true })
+watch(lbSettings, sendLbSettings, { deep: true })
 watch(
   () => props.app.orientation,
   (nextOrientation) => orientation.apply(nextOrientation),
@@ -331,6 +397,7 @@ watch(() => catalog.openRequests[props.app.id], flushOpenRequest, {
     }"
   >
     <iframe
+      v-if="frameMountable"
       ref="frame"
       v-show="frameReady && !frameUnavailable"
       class="custom-app-frame"
@@ -338,7 +405,8 @@ watch(() => catalog.openRequests[props.app.id], flushOpenRequest, {
         'custom-app-frame--fix-blur': app.compatibility.fixBlur === true,
       }"
       :sandbox="sandbox"
-      :src="frameUrl"
+      :src="frameSource"
+      :srcdoc="lbFrameDocument ?? undefined"
       :title="app.name"
       referrerpolicy="no-referrer"
       @load="onFrameLoad"
diff --git a/frontend/src/utils/lbPhoneAppBridge.test.ts b/frontend/src/utils/lbPhoneAppBridge.test.ts
new file mode 100644
index 0000000..c26af99
--- /dev/null
+++ b/frontend/src/utils/lbPhoneAppBridge.test.ts
@@ -0,0 +1,119 @@
+import { describe, expect, it } from 'vitest'
+
+import type { ExternalPhoneAppDefinition } from '@/types/apps'
+import {
+  createLbPhoneFrameDocument,
+  createLbPhoneHostSettings,
+  getLbPhoneCallbackResource,
+  usesLbPhoneHostRuntime,
+} from '@/utils/lbPhoneAppBridge'
+import { DEFAULT_PHONE_PREFERENCES } from '@/utils/preferences'
+
+function externalApp(
+  overrides: Partial<ExternalPhoneAppDefinition> = {},
+): ExternalPhoneAppDefinition {
+  return {
+    bridgeMode: 'legacy',
+    bundled: false,
+    capabilities: [],
+    category: 'games',
+    compatibility: { provider: 'lb_phone', resourceName: 'snake_app' },
+    component: null,
+    defaultInstalled: true,
+    description: 'Snake',
+    developer: 'Example',
+    dockOrder: null,
+    gridOrder: 100,
+    icon: {} as ExternalPhoneAppDefinition['icon'],
+    iconClass: 'app-icon--custom',
+    iconImage: 'https://cfx-nui-snake_app/ui/icon.png',
+    id: 'snake-game' as ExternalPhoneAppDefinition['id'],
+    kind: 'external',
+    name: 'Snake',
+    orientation: 'portrait',
+    ownerResource: 'phone_adapter',
+    readyTimeoutMs: 8000,
+    removable: true,
+    route: '/apps/snake-game' as ExternalPhoneAppDefinition['route'],
+    ui: 'https://cfx-nui-snake_app/ui/dist/index.html',
+    ...overrides,
+  }
+}
+
+describe('LB Phone app bridge', () => {
+  it('selects local LB documents without taking over query-driven apps', () => {
+    expect(usesLbPhoneHostRuntime(externalApp())).toBe(true)
+    expect(
+      usesLbPhoneHostRuntime(
+        externalApp({
+          ui: 'https://cfx-nui-snake_app/ui/index.html?route=/dispatch',
+        }),
+      ),
+    ).toBe(false)
+    expect(
+      usesLbPhoneHostRuntime(
+        externalApp({ compatibility: { provider: '17mov' } }),
+      ),
+    ).toBe(false)
+  })
+
+  it('uses the declared callback resource and rejects malformed overrides', () => {
+    expect(getLbPhoneCallbackResource(externalApp())).toBe('snake_app')
+    expect(
+      getLbPhoneCallbackResource(
+        externalApp({
+          compatibility: {
+            provider: 'lb_phone',
+            resourceName: '../wrong',
+          },
+        }),
+      ),
+    ).toBe('phone_adapter')
+  })
+
+  it('maps phone preferences into the LB settings contract', () => {
+    const settings = createLbPhoneHostSettings({
+      deviceName: 'Main phone',
+      isDarkMode: true,
+      language: 'de',
+      preferences: DEFAULT_PHONE_PREFERENCES,
+      securityEnabled: true,
+    })
+
+    expect(settings).toMatchObject({
+      display: { brightness: 1, size: 1, theme: 'dark' },
+      locale: 'de',
+      name: 'Main phone',
+      security: { pinCode: true },
+    })
+  })
+
+  it('injects the LB runtime and asset base before the vendor bundle', () => {
+    const html =
+      '<!doctype html><html><head><script type="module" src="/ui/dist/assets/index.js"></script></head><body></body></html>'
+    const document = createLbPhoneFrameDocument(html, {
+      appName: 'snake-game',
+      resourceName: 'snake_app',
+      settings: createLbPhoneHostSettings({
+        deviceName: '</script><script>window.injected=true</script>',
+        isDarkMode: false,
+        language: 'en',
+        preferences: DEFAULT_PHONE_PREFERENCES,
+        securityEnabled: false,
+      }),
+      ui: 'https://cfx-nui-snake_app/ui/dist/index.html',
+    })
+
+    expect(document.indexOf('<base href=')).toBeLessThan(
+      document.indexOf('src="/ui/dist/assets/index.js"'),
+    )
+    expect(document).toContain('globalThis.fetchNui = async')
+    expect(document).toContain('globalThis.onNuiEvent = globalThis.useNuiEvent')
+    expect(document).toContain('https://cfx-nui-snake_app/ui/dist/')
+    expect(document).not.toContain('</script><script>window.injected=true')
+
+    const runtime = /<script>([\s\S]*?)<\/script>/.exec(document)?.[1]
+    expect(runtime).toBeTruthy()
+    expect(() => new Function(runtime ?? '')).not.toThrow()
+  })
+})
diff --git a/frontend/src/utils/lbPhoneAppBridge.ts b/frontend/src/utils/lbPhoneAppBridge.ts
new file mode 100644
index 0000000..da52aa2
--- /dev/null
+++ b/frontend/src/utils/lbPhoneAppBridge.ts
@@ -0,0 +1,237 @@
+import type { ExternalPhoneAppDefinition } from '@/types/apps'
+import type { PhonePreferencesV1 } from '@/utils/preferences'
+
+const LB_PHONE_PROVIDER = 'lb_phone'
+const RESOURCE_NAME_PATTERN = /^[A-Za-z0-9][A-Za-z0-9_.-]{0,127}$/
+const MAX_FRAME_DOCUMENT_BYTES = 1_048_576
+
+export type LbPhoneHostSettings = {
+  airplaneMode: boolean
+  apps: string[][]
+  display: {
+    automatic: boolean
+    brightness: number
+    size: number
+    theme: 'dark' | 'light'
+  }
+  doNotDisturb: boolean
+  locale: string
+  lockscreen: {
+    color: string
+    fontStyle: number
+    layout: number
+  }
+  name: string
+  notifications: Record<string, { enabled: boolean; sound: boolean }>
+  phone: { showCallerId: boolean }
+  security: { faceId: boolean; pinCode: boolean }
+  sound: {
+    ringtone: string
+    silent: boolean
+    texttone: string
+    volume: number
+  }
+  storage: { total: number; used: number }
+  streamerMode: boolean
+  time: { twelveHourClock: boolean }
+  version: string
+  wallpaper: { background: string }
+  weather: { celcius: boolean }
+}
+
+type LbPhoneFrameDocumentOptions = {
+  appName: string
+  resourceName: string
+  settings: LbPhoneHostSettings
+  ui: string
+}
+
+type LbPhoneSettingsOptions = {
+  deviceName: string
+  isDarkMode: boolean
+  language: string
+  preferences: PhonePreferencesV1
+  securityEnabled: boolean
+}
+
+const LB_PHONE_RUNTIME_SOURCE = String.raw`
+const listeners = new Map();
+const settingsListeners = new Set();
+const resourcePattern = /^[A-Za-z0-9][A-Za-z0-9_.-]{0,127}$/;
+const eventPattern = /^[A-Za-z0-9][A-Za-z0-9:._/-]{0,127}$/;
+
+function applySettings(nextSettings) {
+  globalThis.settings = nextSettings;
+  const theme = nextSettings?.display?.theme === 'dark' ? 'dark' : 'light';
+  document.documentElement.dataset.theme = theme;
+  if (document.body) document.body.dataset.theme = theme;
+}
+
+globalThis.resourceName = config.resourceName;
+globalThis.appName = config.appName;
+globalThis.components = globalThis.components ?? {};
+globalThis.GetParentResourceName = () => config.resourceName;
+globalThis.fetchNui = async (eventName, data, requestedResource) => {
+  if (typeof eventName !== 'string' || !eventPattern.test(eventName) || eventName.includes('..')) {
+    throw new TypeError('Invalid NUI callback name');
+  }
+
+  const targetResource = typeof requestedResource === 'string'
+    ? requestedResource
+    : config.resourceName;
+  if (!resourcePattern.test(targetResource)) {
+    throw new TypeError('Invalid NUI callback resource');
+  }
+
+  const response = await fetch('https://' + targetResource + '/' + eventName, {
+    body: JSON.stringify(data === undefined ? {} : data),
+    headers: { 'Content-Type': 'application/json; charset=UTF-8' },
+    method: 'POST'
+  });
+  if (!response.ok) {
+    throw new Error('NUI callback failed with HTTP ' + response.status);
+  }
+
+  const body = await response.text();
+  return body ? JSON.parse(body) : null;
+};
+globalThis.onNuiEvent = globalThis.useNuiEvent = (eventName, callback) => {
+  if (typeof eventName !== 'string' || !eventPattern.test(eventName) || typeof callback !== 'function') {
+    throw new TypeError('Invalid NUI event listener');
+  }
+  const callbacks = listeners.get(eventName) ?? new Set();
+  callbacks.add(callback);
+  listeners.set(eventName, callbacks);
+};
+globalThis.onSettingsChange = (callback) => {
+  if (typeof callback !== 'function') throw new TypeError('Invalid settings listener');
+  settingsListeners.add(callback);
+};
+globalThis.getSettings = async () => globalThis.settings;
+
+globalThis.addEventListener('message', (event) => {
+  const message = event.data;
+  if (!message || typeof message !== 'object') return;
+
+  if (message.type === 'sky-phone:lb-settings') {
+    applySettings(message.settings);
+    for (const callback of settingsListeners) callback(globalThis.settings);
+    return;
+  }
+
+  const eventName = typeof message.action === 'string'
+    ? message.action
+    : typeof message.type === 'string'
+      ? message.type
+      : null;
+  if (!eventName) return;
+  const data = Object.prototype.hasOwnProperty.call(message, 'data')
+    ? message.data
+    : message;
+  for (const callback of listeners.get(eventName) ?? []) callback(data);
+});
+
+applySettings(config.settings);
+document.addEventListener('DOMContentLoaded', () => applySettings(globalThis.settings), { once: true });
+`
+
+function escapeAttribute(value: string): string {
+  return value
+    .replace(/&/g, '&amp;')
+    .replace(/"/g, '&quot;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+}
+
+function serializeForInlineScript(value: unknown): string {
+  return JSON.stringify(value)
+    .replace(/</g, '\\u003c')
+    .replace(/\u2028/g, '\\u2028')
+    .replace(/\u2029/g, '\\u2029')
+}
+
+export function usesLbPhoneHostRuntime(
+  app: ExternalPhoneAppDefinition,
+): boolean {
+  if (app.compatibility.provider !== LB_PHONE_PROVIDER) return false
+
+  const url = new URL(app.ui)
+  return url.protocol === 'https:' && url.search === ''
+}
+
+export function getLbPhoneCallbackResource(
+  app: ExternalPhoneAppDefinition,
+): string {
+  const configured = app.compatibility.resourceName
+  return typeof configured === 'string' &&
+    RESOURCE_NAME_PATTERN.test(configured)
+    ? configured
+    : app.ownerResource
+}
+
+export function createLbPhoneHostSettings(
+  options: LbPhoneSettingsOptions,
+): LbPhoneHostSettings {
+  const preferences = options.preferences.settings
+  return {
+    airplaneMode: preferences.airplaneMode,
+    apps: [],
+    display: {
+      automatic: preferences.appearanceMode === 'automatic',
+      brightness: preferences.screenBrightness / 100,
+      size: preferences.phoneScale / 100,
+      theme: options.isDarkMode ? 'dark' : 'light',
+    },
+    doNotDisturb: preferences.focusMode,
+    locale: options.language,
+    lockscreen: { color: '#ffffff', fontStyle: 0, layout: 0 },
+    name: options.deviceName,
+    notifications: Object.fromEntries(
+      Object.entries(preferences.notifications).map(([appId, settings]) => [
+        appId,
+        { enabled: settings.enabled, sound: settings.sounds },
+      ]),
+    ),
+    phone: { showCallerId: true },
+    security: { faceId: false, pinCode: options.securityEnabled },
+    sound: {
+      ringtone: preferences.ringtone,
+      silent:
+        preferences.notificationVolume === 0 &&
+        preferences.ringtoneVolume === 0,
+      texttone: preferences.notificationSound,
+      volume: preferences.notificationVolume / 100,
+    },
+    storage: { total: 0, used: 0 },
+    streamerMode: preferences.streamerMode,
+    time: { twelveHourClock: false },
+    version: 'sky_phone',
+    wallpaper: { background: preferences.wallpaper },
+    weather: { celcius: true },
+  }
+}
+
+export function createLbPhoneFrameDocument(
+  html: string,
+  options: LbPhoneFrameDocumentOptions,
+): string {
+  if (
+    new TextEncoder().encode(html).byteLength > MAX_FRAME_DOCUMENT_BYTES ||
+    !RESOURCE_NAME_PATTERN.test(options.resourceName)
+  ) {
+    throw new Error('invalid_lb_phone_frame_document')
+  }
+
+  const head = /<head(?:\s[^>]*)?>/i.exec(html)
+  if (!head) throw new Error('invalid_lb_phone_frame_document')
+
+  const baseUrl = new URL('.', options.ui).href
+  const config = serializeForInlineScript({
+    appName: options.appName,
+    resourceName: options.resourceName,
+    settings: options.settings,
+  })
+  const injection = `<base href="${escapeAttribute(baseUrl)}"><script>(() => { const config = ${config};${LB_PHONE_RUNTIME_SOURCE}\n})();<\/script>`
+  const insertionPoint = head.index + head[0].length
+  return `${html.slice(0, insertionPoint)}${injection}${html.slice(insertionPoint)}`
+}
diff --git a/sky_phone/source/shared/custom_app_compat.lua b/sky_phone/source/shared/custom_app_compat.lua
index ff14ea1..514ddff 100644
--- a/sky_phone/source/shared/custom_app_compat.lua
+++ b/sky_phone/source/shared/custom_app_compat.lua
@@ -137,6 +137,7 @@ function SkyPhoneCompatibility.BuildLbDefinition(owner_resource, app_data)
         compatibility = {
             provider = SkyPhoneCompatibility.Providers.lb,
             apiVersion = 1,
+            resourceName = type(app_data.resource) == "string" and app_data.resource or owner_resource,
         },
     }
 end
diff --git a/tests/custom_app_compat.lua b/tests/custom_app_compat.lua
index 55c79b4..2613ad3 100644
--- a/tests/custom_app_compat.lua
+++ b/tests/custom_app_compat.lua
@@ -13,6 +13,18 @@ assert(lb_definition.id == "dispatch", "LB identifier must map to the Sky app ID
 assert(lb_definition.ui == "ui/index.html", "LB relative UI must remain owner-relative")
 assert(lb_definition.orientation == "landscape", "LB landscape flag must be preserved")
 assert(type(lb_definition.onOpen) == "function", "LB onUse must map to the open lifecycle")
+assert(lb_definition.compatibility.resourceName == "lb_app", "LB callbacks must target the registering resource")
+
+local bridged_lb_definition = assert(SkyPhoneCompatibility.BuildLbDefinition("phone_adapter", {
+    identifier = "bridged",
+    name = "Bridged",
+    ui = "manufacturer_app/ui/index.html",
+    resource = "manufacturer_app",
+}))
+assert(
+    bridged_lb_definition.compatibility.resourceName == "manufacturer_app",
+    "LB adapter callbacks must target the declared app resource"
+)
 
 local invalid_lb, invalid_lb_error = SkyPhoneCompatibility.BuildLbDefinition("lb_app", {
     identifier = "dispatch",