diff --git a/.github/workflows/build-samples-todoapp-avalonia.yml b/.github/workflows/build-samples-todoapp-avalonia.yml
index f84d0413..a5e5a08 100644
--- a/.github/workflows/build-samples-todoapp-avalonia.yml
+++ b/.github/workflows/build-samples-todoapp-avalonia.yml
@@ -8,18 +8,21 @@ env:
   DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
   DOTNET_NOLOGO: true
   DOTNET_CONFIGURATION: 'Release'
-  # NOTE: This sample's solution (TodoApp.Avalonia.sln) also contains Android and iOS
-  # heads (net10.0-android / net10.0-ios), which require mobile workloads and are tracked
-  # separately in https://github.com/CommunityToolkit/Datasync/issues/511 (Phase 3). Only
-  # the shared and Desktop (net10.0) projects are built directly here, not the full .sln.
+  # NOTE: This sample's solution (TodoApp.Avalonia.sln) also contains Android and iOS heads
+  # (net10.0-android / net10.0-ios). Only the shared and Desktop (net10.0) projects are built
+  # directly here, not the full .sln - the Android and iOS heads are built by their own jobs
+  # below, each restoring/building its own project directly so only the workload needed for
+  # that head is installed on that runner.
   SharedProjectFile: 'samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia/TodoApp.Avalonia.csproj'
   DesktopProjectFile: 'samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.Desktop/TodoApp.Avalonia.Desktop.csproj'
+  AndroidProjectFile: 'samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.Android/TodoApp.Avalonia.Android.csproj'
+  iOSProjectFile: 'samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.iOS/TodoApp.Avalonia.iOS.csproj'
 
 permissions:
   contents: read
 
 jobs:
-  build:
+  desktop:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Repository
@@ -47,3 +50,50 @@ jobs:
           dotnet build ${{ env.DesktopProjectFile }}
           --configuration ${{ env.DOTNET_CONFIGURATION }}
           --no-restore
+
+  android:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Install Android workload
+        run: dotnet workload install android
+
+      - name: Restore Android project
+        run: dotnet restore ${{ env.AndroidProjectFile }}
+
+      - name: Build Android project
+        run: >
+          dotnet build ${{ env.AndroidProjectFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+  ios:
+    # iOS builds require Xcode, which is only available on macOS runners.
+    runs-on: macos-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Install iOS workload
+        run: dotnet workload install ios
+
+      - name: Restore iOS project
+        run: dotnet restore ${{ env.iOSProjectFile }}
+
+      - name: Build iOS project
+        run: >
+          dotnet build ${{ env.iOSProjectFile }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
diff --git a/.github/workflows/build-samples-todoapp-maui.yml b/.github/workflows/build-samples-todoapp-maui.yml
new file mode 100644
index 0000000..5f03eda
--- /dev/null
+++ b/.github/workflows/build-samples-todoapp-maui.yml
@@ -0,0 +1,72 @@
+name: Build Sample - TodoApp MAUI (Android / iOS)
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  # TodoApp.MAUI.csproj targets net10.0-android;net10.0-ios, with net10.0-windows10.0.19041.0
+  # conditionally appended only when building on Windows (that head is built separately in
+  # build-samples-todoapp-windows.yml). Restore/build here is explicitly scoped to one mobile
+  # TargetFramework per job so each runner only needs the workload for its own head.
+  MauiProjectFile: 'samples/todoapp/TodoApp.MAUI/TodoApp.MAUI.csproj'
+  AndroidTargetFramework: 'net10.0-android'
+  iOSTargetFramework: 'net10.0-ios'
+
+permissions:
+  contents: read
+
+jobs:
+  android:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Install MAUI Android workload
+        run: dotnet workload install maui-android
+
+      - name: Restore MAUI project (Android TFM only)
+        # NOTE: 'dotnet restore' has no -f|--framework option (-f means --force there, unlike
+        # 'dotnet build'). Use the MSBuild property directly to scope restore to one TFM.
+        run: dotnet restore ${{ env.MauiProjectFile }} -p:TargetFramework=${{ env.AndroidTargetFramework }}
+
+      - name: Build MAUI project (Android TFM only)
+        run: >
+          dotnet build ${{ env.MauiProjectFile }}
+          -f ${{ env.AndroidTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+  ios:
+    # iOS builds require Xcode, which is only available on macOS runners.
+    runs-on: macos-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Install MAUI iOS workload
+        run: dotnet workload install maui-ios
+
+      - name: Restore MAUI project (iOS TFM only)
+        run: dotnet restore ${{ env.MauiProjectFile }} -p:TargetFramework=${{ env.iOSTargetFramework }}
+
+      - name: Build MAUI project (iOS TFM only)
+        run: >
+          dotnet build ${{ env.MauiProjectFile }}
+          -f ${{ env.iOSTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
diff --git a/.github/workflows/build-samples-todoapp-uno.yml b/.github/workflows/build-samples-todoapp-uno.yml
new file mode 100644
index 0000000..635a486
--- /dev/null
+++ b/.github/workflows/build-samples-todoapp-uno.yml
@@ -0,0 +1,165 @@
+name: Build Sample - TodoApp Uno
+
+# NOTE: This workflow is NOT currently wired into build-samples.yml. TodoApp.Uno.csproj fails
+# to restore on every head with NU1605 (Uno.WinUI version downgrade caused by
+# CommunityToolkit.WinUI.Behaviors' floor vs. the Uno.Sdk pin in global.json) - see the jobs
+# below and https://github.com/CommunityToolkit/Datasync/issues/506, which is tracking the fix.
+# Re-add the `todoapp-uno` job to build-samples.yml (and to all-samples-built's `needs`) once
+# #506 is resolved and TodoApp.Uno.csproj restores cleanly.
+
+on:
+  workflow_call:
+
+env:
+  DOTNET_VERSION: '10.0.x'
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: 1
+  DOTNET_NOLOGO: true
+  DOTNET_CONFIGURATION: 'Release'
+  # TodoApp.Uno.csproj is a single Uno.Sdk project with a multi-head TargetFrameworks list
+  # (net10.0-android;net10.0-ios;net10.0-maccatalyst;net10.0-windows10.0.26100;
+  # net10.0-browserwasm;net10.0-desktop). No single runner can build every head (mobile heads
+  # need Android/iOS workloads, the Windows head needs windows-latest, etc.), so each job below
+  # restores/builds one head at a time, scoped via the MSBuild TargetFramework property.
+  UnoProjectFile: 'samples/todoapp/TodoApp.Uno/TodoApp.Uno/TodoApp.Uno.csproj'
+  AndroidTargetFramework: 'net10.0-android'
+  iOSTargetFramework: 'net10.0-ios'
+  MacCatalystTargetFramework: 'net10.0-maccatalyst'
+  WindowsTargetFramework: 'net10.0-windows10.0.26100'
+  BrowserWasmTargetFramework: 'net10.0-browserwasm'
+  DesktopTargetFramework: 'net10.0-desktop'
+
+permissions:
+  contents: read
+
+jobs:
+  android:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Install Android workload
+        run: dotnet workload install android
+
+      - name: Restore Uno project (Android TFM only)
+        # NOTE: 'dotnet restore' has no -f|--framework option (-f means --force there, unlike
+        # 'dotnet build'). Use the MSBuild property directly to scope restore to one TFM.
+        run: dotnet restore ${{ env.UnoProjectFile }} -p:TargetFramework=${{ env.AndroidTargetFramework }}
+
+      - name: Build Uno project (Android TFM only)
+        run: >
+          dotnet build ${{ env.UnoProjectFile }}
+          -f ${{ env.AndroidTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+  ios-maccatalyst:
+    # iOS and Mac Catalyst builds both require Xcode, which is only available on macOS runners.
+    runs-on: macos-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Install iOS and Mac Catalyst workloads
+        run: dotnet workload install ios maccatalyst
+
+      - name: Restore Uno project (iOS TFM only)
+        run: dotnet restore ${{ env.UnoProjectFile }} -p:TargetFramework=${{ env.iOSTargetFramework }}
+
+      - name: Build Uno project (iOS TFM only)
+        run: >
+          dotnet build ${{ env.UnoProjectFile }}
+          -f ${{ env.iOSTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+      - name: Restore Uno project (Mac Catalyst TFM only)
+        run: dotnet restore ${{ env.UnoProjectFile }} -p:TargetFramework=${{ env.MacCatalystTargetFramework }}
+
+      - name: Build Uno project (Mac Catalyst TFM only)
+        run: >
+          dotnet build ${{ env.UnoProjectFile }}
+          -f ${{ env.MacCatalystTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+  windows:
+    runs-on: windows-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore Uno project (Windows TFM only)
+        run: dotnet restore ${{ env.UnoProjectFile }} -p:TargetFramework=${{ env.WindowsTargetFramework }}
+
+      - name: Build Uno project (Windows TFM only)
+        run: >
+          dotnet build ${{ env.UnoProjectFile }}
+          -f ${{ env.WindowsTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+  browserwasm:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Install WebAssembly build tools workload
+        run: dotnet workload install wasm-tools
+
+      - name: Restore Uno project (Browser WebAssembly TFM only)
+        run: dotnet restore ${{ env.UnoProjectFile }} -p:TargetFramework=${{ env.BrowserWasmTargetFramework }}
+
+      - name: Build Uno project (Browser WebAssembly TFM only)
+        run: >
+          dotnet build ${{ env.UnoProjectFile }}
+          -f ${{ env.BrowserWasmTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
+
+  desktop:
+    # NOTE: this head (along with every other head in this file) currently fails to restore
+    # with NU1605 - see the file-level NOTE above and #506. #506 originally reported the NU1903
+    # Tmds.DBus audit warning for this head specifically; that warning alone is harmless (this
+    # repo does not configure NuGet audit to fail on warnings), but the NU1605 uncovered while
+    # investigating it turned out to be project-wide, not desktop-specific.
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v7
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v5
+        with:
+          dotnet-version: ${{ env.DOTNET_VERSION }}
+
+      - name: Restore Uno project (Desktop TFM only)
+        run: dotnet restore ${{ env.UnoProjectFile }} -p:TargetFramework=${{ env.DesktopTargetFramework }}
+
+      - name: Build Uno project (Desktop TFM only)
+        run: >
+          dotnet build ${{ env.UnoProjectFile }}
+          -f ${{ env.DesktopTargetFramework }}
+          --configuration ${{ env.DOTNET_CONFIGURATION }}
+          --no-restore
diff --git a/.github/workflows/build-samples-todoapp-windows.yml b/.github/workflows/build-samples-todoapp-windows.yml
index 73fba07..dd8c2e4 100644
--- a/.github/workflows/build-samples-todoapp-windows.yml
+++ b/.github/workflows/build-samples-todoapp-windows.yml
@@ -14,8 +14,8 @@ env:
   WpfProjectFile: 'samples/todoapp/TodoApp.WPF/TodoApp.WPF.csproj'
   # TodoApp.MAUI.csproj targets net10.0-android;net10.0-ios, with net10.0-windows10.0.19041.0
   # conditionally appended only when building on Windows. Android/iOS heads require separate
-  # workloads and are tracked in https://github.com/CommunityToolkit/Datasync/issues/511 (Phase 3),
-  # so restore/build here is explicitly scoped to the Windows TargetFramework only.
+  # workloads and are built by build-samples-todoapp-maui.yml instead, so restore/build here is
+  # explicitly scoped to the Windows TargetFramework only.
   MauiProjectFile: 'samples/todoapp/TodoApp.MAUI/TodoApp.MAUI.csproj'
   MauiWindowsTargetFramework: 'net10.0-windows10.0.19041.0'
 
diff --git a/.github/workflows/build-samples.yml b/.github/workflows/build-samples.yml
index 31faae6..aa7de6d 100644
--- a/.github/workflows/build-samples.yml
+++ b/.github/workflows/build-samples.yml
@@ -34,9 +34,23 @@ jobs:
   todoapp-windows:
     uses: ./.github/workflows/build-samples-todoapp-windows.yml
 
+  todoapp-maui:
+    uses: ./.github/workflows/build-samples-todoapp-maui.yml
+
+  # NOTE: todoapp-uno (build-samples-todoapp-uno.yml) is intentionally NOT wired in here.
+  # TodoApp.Uno.csproj fails to restore on every head with:
+  #   NU1605: Detected package downgrade: Uno.WinUI from 5.5.87 to 5.4.22
+  #   TodoApp.Uno -> CommunityToolkit.WinUI.Behaviors 8.2.250402 -> Uno.WinUI (>= 5.5.87)
+  #   TodoApp.Uno -> Uno.WinUI (>= 5.4.22)
+  # This is unconditional (CommunityToolkit.WinUI.Behaviors has no TFM condition on its
+  # PackageReference), so it blocks every TFM, not just the desktop head as originally
+  # suspected. See https://github.com/CommunityToolkit/Datasync/issues/506, which is tracking
+  # the underlying Uno.WinUI/CommunityToolkit.WinUI.Behaviors version conflict. Re-enable this
+  # job (add it back to the jobs list and to all-samples-built's needs below) once #506 is
+  # resolved and TodoApp.Uno.csproj restores cleanly.
+
   # Single aggregation point so branch protection only needs to require one check,
-  # regardless of how many sample workflows are added over time (see Phase 3
-  # follow-up: https://github.com/CommunityToolkit/Datasync/issues/511).
+  # regardless of how many sample workflows are added over time.
   all-samples-built:
     name: All samples built
     if: always()
@@ -48,6 +62,7 @@ jobs:
       - todoapp-tutorial
       - todoapp-avalonia
       - todoapp-windows
+      - todoapp-maui
     runs-on: ubuntu-latest
     steps:
       - name: Check sample build results
diff --git a/samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.iOS/Info.plist b/samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.iOS/Info.plist
index 8446c28..643284c 100644
--- a/samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.iOS/Info.plist
+++ b/samples/todoapp/TodoApp.Avalonia/TodoApp.Avalonia.iOS/Info.plist
@@ -13,7 +13,7 @@
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>MinimumOSVersion</key>
-	<string>13.0</string>
+	<string>15.0</string>
 	<key>UIDeviceFamily</key>
 	<array>
 		<integer>1</integer>