diff --git a/res/layout-land/main_calculator.xml b/res/layout-land/main_calculator.xml
new file mode 100644
index 00000000..83ddd626
--- /dev/null
+++ b/res/layout-land/main_calculator.xml
@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<LinearLayout xmlns:a="http://schemas.android.com/apk/res/android"
+			  xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
+			  a:orientation="vertical"
+			  a:layout_width="fill_parent"
+			  a:layout_height="fill_parent"
+			  a:background="#ff000000">
+
+	<LinearLayout
+			a:layout_width="fill_parent"
+			a:layout_height="fill_parent"
+			a:orientation="vertical"
+			a:layout_gravity="center">
+
+		<include layout="@layout/calc_editor"/>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<org.solovyev.android.view.widgets.DirectionDragButton xmlns:a="http://schemas.android.com/apk/res/android"
+																   xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
+																   a:id="@+id/leftButton"
+																   calc:textUp="◀◀"
+																   a:text="◀"
+																   calc:directionTextScale="0.5"
+																   style="?controlButtonStyle"
+																   a:onClick="moveLeftButtonClickHandler"
+																   a:layout_width="0dp"
+																   a:layout_height="fill_parent"
+																   a:layout_weight="1"/>
+
+
+			<org.solovyev.android.view.widgets.ColorButton xmlns:a="http://schemas.android.com/apk/res/android"
+														   xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
+														   a:id="@+id/eraseButton"
+														   a:drawableTop="@drawable/sym_keyboard_delete"
+														   style="?controlImageButtonStyle"
+														   a:onClick="eraseButtonClickHandler"
+														   a:layout_width="0dp"
+														   a:layout_height="fill_parent"
+														   a:layout_weight="1"/>
+
+
+			<include layout="@layout/calc_display"
+					 a:layout_width="0dp"
+					 a:layout_height="fill_parent"
+					 a:layout_weight="4"/>
+
+			<org.solovyev.android.view.widgets.ColorButton xmlns:a="http://schemas.android.com/apk/res/android"
+														   xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
+														   a:id="@+id/clearButton"
+														   a:text="@string/c_clear"
+														   a:textStyle="bold"
+														   style="?controlImageButtonStyle"
+														   a:onClick="clearButtonClickHandler"
+														   a:layout_width="0dp"
+														   a:layout_height="fill_parent"
+														   a:layout_weight="1"/>
+
+			<org.solovyev.android.view.widgets.DirectionDragButton xmlns:a="http://schemas.android.com/apk/res/android"
+																   xmlns:calc="http://schemas.android.com/apk/res/org.solovyev.android.calculator"
+																   a:id="@+id/rightButton"
+																   calc:textUp="▶▶"
+																   a:text="▶"
+																   calc:directionTextScale="0.5"
+																   style="?controlButtonStyle"
+																   a:onClick="moveRightButtonClickHandler"
+																   a:layout_width="0dp"
+																   a:layout_height="fill_parent"
+																   a:layout_weight="1"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_history_button"/>
+			<include layout="@layout/calc_copy_button"/>
+			<include layout="@layout/calc_seven_digit_button"/>
+			<include layout="@layout/calc_eight_digit_button"/>
+			<include layout="@layout/calc_nine_digit_button"/>
+			<include layout="@layout/calc_multiplication_button"/>
+			<include layout="@layout/calc_division_button"/>
+			<include layout="@layout/calc_equals_button"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_vars_button"/>
+			<include layout="@layout/calc_paste_button"/>
+			<include layout="@layout/calc_four_digit_button"/>
+			<include layout="@layout/calc_five_digit_button"/>
+			<include layout="@layout/calc_six_digit_button"/>
+			<include layout="@layout/calc_plus_button"/>
+			<include layout="@layout/calc_subtraction_button"/>
+			<include layout="@layout/calc_empty_button"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_donate_button"/>
+			<include layout="@layout/calc_empty_button"/>
+			<include layout="@layout/calc_one_digit_button"/>
+			<include layout="@layout/calc_two_digit_button"/>
+			<include layout="@layout/calc_three_digit_button"/>
+			<include layout="@layout/calc_zero_digit_button"/>
+			<include layout="@layout/calc_round_brackets_button"/>
+			<include layout="@layout/calc_square_brackets_button"/>
+
+		</LinearLayout>
+
+	</LinearLayout>
+</LinearLayout>
diff --git a/res/layout-land/main.xml b/res/layout-land/main_cellphone.xml
similarity index 100%
rename from res/layout-land/main.xml
rename to res/layout-land/main_cellphone.xml
diff --git a/res/layout-port/main_calculator.xml b/res/layout-port/main_calculator.xml
new file mode 100644
index 00000000..58a74050
--- /dev/null
+++ b/res/layout-port/main_calculator.xml
@@ -0,0 +1,88 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (c) 2009-2011. Created by serso aka se.solovyev.
+  ~ For more information, please, contact se.solovyev@gmail.com
+  ~ or visit http://se.solovyev.org
+  -->
+
+<LinearLayout xmlns:a="http://schemas.android.com/apk/res/android"
+			  a:orientation="vertical"
+			  a:layout_width="fill_parent"
+			  a:layout_height="fill_parent"
+			  a:background="#ff000000">
+
+	<LinearLayout
+			a:layout_width="fill_parent"
+			a:layout_height="fill_parent"
+			a:orientation="vertical"
+			a:layout_gravity="center">
+
+		<include layout="@layout/calc_editor"/>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_equals_button"
+					 a:layout_weight="4"
+					 a:layout_width="fill_parent"
+					 a:layout_height="fill_parent"/>
+
+			<include layout="@layout/calc_display"
+					 a:layout_weight="1"
+					 a:layout_width="fill_parent"
+					 a:layout_height="fill_parent"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_seven_digit_button"/>
+			<include layout="@layout/calc_eight_digit_button"/>
+			<include layout="@layout/calc_nine_digit_button"/>
+			<include layout="@layout/calc_multiplication_button"/>
+			<include layout="@layout/calc_clear_button"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_four_digit_button"/>
+			<include layout="@layout/calc_five_digit_button"/>
+			<include layout="@layout/calc_six_digit_button"/>
+			<include layout="@layout/calc_division_button"/>
+			<include layout="@layout/calc_erase_button"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_one_digit_button"/>
+			<include layout="@layout/calc_two_digit_button"/>
+			<include layout="@layout/calc_three_digit_button"/>
+			<include layout="@layout/calc_plus_button"/>
+			<include layout="@layout/calc_copy_button"/>
+
+		</LinearLayout>
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_round_brackets_button"/>
+			<include layout="@layout/calc_zero_digit_button"/>
+			<include layout="@layout/calc_square_brackets_button"/>
+			<include layout="@layout/calc_subtraction_button"/>
+			<include layout="@layout/calc_paste_button"/>
+
+		</LinearLayout>
+
+
+		<LinearLayout a:layout_weight="1" a:layout_width="fill_parent" a:layout_height="0dp">
+
+			<include layout="@layout/calc_left_button"/>
+			<include layout="@layout/calc_right_button"/>
+			<include layout="@layout/calc_vars_button"/>
+			<include layout="@layout/calc_history_button"/>
+			<include layout="@layout/calc_donate_button"/>
+
+		</LinearLayout>
+	</LinearLayout>
+</LinearLayout>
diff --git a/res/layout-port/main.xml b/res/layout-port/main_cellphone.xml
similarity index 100%
rename from res/layout-port/main.xml
rename to res/layout-port/main_cellphone.xml
diff --git a/res/values-ru/strings.xml b/res/values-ru/strings.xml
index e4d49319..aa7fe8e8 100644
--- a/res/values-ru/strings.xml
+++ b/res/values-ru/strings.xml
@@ -92,4 +92,9 @@
 	<string name="c_calc_grouping_separator">Разделитель разрядов</string>
 	<string name="c_calc_grouping_separator_summary">Устанавливает разделитель разрядов числа</string>
 
+	<string name="c_calc_layout">Раскладка</string>
+	<string name="p_layout_cellphone">Телефон</string>
+	<string name="p_layout_calculator">Калькулятор</string>
+	<string name="c_calc_layout_summary">Устанавливает раскладку кнопок</string>
+
 </resources>
diff --git a/res/values/arrays.xml b/res/values/arrays.xml
index 9fdb58ab..19744b9e 100644
--- a/res/values/arrays.xml
+++ b/res/values/arrays.xml
@@ -27,4 +27,13 @@
 		<item>" "</item>
 	</string-array>
 
+	<string-array name="p_layout_names">
+		<item>@string/p_layout_cellphone</item>
+		<item>@string/p_layout_calculator</item>
+	</string-array>
+	<string-array name="p_layout_values">
+		<item>main_cellphone</item>
+		<item>main_calculator</item>
+	</string-array>
+
 </resources>
\ No newline at end of file
diff --git a/res/values/default_values.xml b/res/values/default_values.xml
index 783249c7..649f8d77 100644
--- a/res/values/default_values.xml
+++ b/res/values/default_values.xml
@@ -24,6 +24,9 @@
 	<string name="p_calc_theme_key">org.solovyev.android.calculator.CalculatorActivity_calc_theme</string>
 	<string name="p_calc_theme">default_theme</string>
 
+	<string name="p_calc_layout_key">org.solovyev.android.calculator.CalculatorActivity_calc_layout</string>
+	<string name="p_calc_layout">main_cellphone</string>
+
 	<string name="p_calc_grouping_separator_key">org.solovyev.android.calculator.CalculatorActivity_calc_grouping_separator</string>
 	<string name="p_calc_grouping_separator"> </string>
 
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 7ca826b0..8e29e53d 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -91,4 +91,10 @@
 	<string name="p_grouping_separator_space">Space ( )</string>
 	<string name="c_calc_grouping_separator">Grouping separator</string>
 	<string name="c_calc_grouping_separator_summary">Sets grouping separator</string>
+
+	<string name="c_calc_layout">Layout</string>
+	<string name="p_layout_cellphone">Cellphone</string>
+	<string name="p_layout_calculator">Calculator</string>
+	<string name="c_calc_layout_summary">Sets layout of buttons</string>
+
 </resources>
diff --git a/res/xml/main_preferences.xml b/res/xml/main_preferences.xml
index b0fa9f55..2812e567 100644
--- a/res/xml/main_preferences.xml
+++ b/res/xml/main_preferences.xml
@@ -29,6 +29,12 @@
 						a:summary="@string/c_calc_theme_summary"
 						a:entryValues="@array/p_theme_values"/>
 
+		<ListPreference a:key="@string/p_calc_layout_key"
+						a:title="@string/c_calc_layout"
+						a:entries="@array/p_layout_names"
+						a:summary="@string/c_calc_layout_summary"
+						a:entryValues="@array/p_layout_values"/>
+
 
 		<!--		<org.solovyev.android.view.prefs.FloatRangeSeekBarPreference
 			  a:key="@string/p_drag_distance_key"
diff --git a/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java b/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java
index f8ec92b3..37b5d2d1 100644
--- a/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java
+++ b/src/main/java/org/solovyev/android/calculator/CalculatorActivity.java
@@ -44,6 +44,9 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 	@NotNull
 	private final Announcer<DragPreferencesChangeListener> dpclRegister = new Announcer<DragPreferencesChangeListener>(DragPreferencesChangeListener.class);
 
+	@NotNull
+	private final static Map<Class<?>, Map<String, Integer>> caches = new HashMap<Class<?>, Map<String, Integer>>(3);
+
 	@NotNull
 	private CalculatorModel calculatorModel;
 
@@ -52,8 +55,8 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 	@NotNull
 	private String themeName;
 
-	// key: style name, value: id of style in R.class
-	private Map<String, Integer> styles = null;
+	@NotNull
+	private String layoutName;
 
 	// ids of drag buttons in R.class
 	private List<Integer> dragButtonIds = null;
@@ -71,7 +74,7 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 		setTheme(preferences);
 		super.onCreate(savedInstanceState);
-		setContentView(R.layout.main);
+		setLayout(preferences);
 
 		firstTimeInit(preferences);
 
@@ -151,24 +154,26 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 		}
 	}
 
-	private synchronized void setTheme(@NotNull SharedPreferences preferences) {
-		if (styles == null) {
-			styles = new HashMap<String, Integer>();
-			for (Field themeField : R.style.class.getDeclaredFields()) {
-				int modifiers = themeField.getModifiers();
-				if (Modifier.isFinal(modifiers) && Modifier.isStatic(modifiers)) {
-					try {
-						Log.d(this.getClass().getName(), "Style found: " + themeField.getName());
-						int styleId = themeField.getInt(R.style.class);
-						Log.d(this.getClass().getName(), "Style id: " + styleId);
-						styles.put(themeField.getName(), styleId);
-					} catch (IllegalAccessException e) {
-						Log.e(CalculatorActivity.class.getName(), e.getMessage());
-					}
-				}
-			}
+
+	private synchronized void setLayout(@NotNull SharedPreferences preferences) {
+		final Map<String, Integer> layouts = getCache(R.layout.class);
+
+		layoutName = preferences.getString(getString(R.string.p_calc_layout_key), getString(R.string.p_calc_layout));
+
+		Integer layoutId = layouts.get(layoutName);
+		if (layoutId == null) {
+			Log.d(this.getClass().getName(), "No saved layout found => applying default layout: " + R.layout.main_cellphone);
+			layoutId = R.layout.main_cellphone;
+		} else {
+			Log.d(this.getClass().getName(), "Saved layout found: " + layoutId);
 		}
 
+		setContentView(layoutId);
+	}
+
+	private synchronized void setTheme(@NotNull SharedPreferences preferences) {
+		final Map<String, Integer> styles = getCache(R.style.class);
+
 		themeName = preferences.getString(getString(R.string.p_calc_theme_key), getString(R.string.p_calc_theme));
 
 		Integer styleId = styles.get(themeName);
@@ -176,12 +181,36 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 			Log.d(this.getClass().getName(), "No saved theme found => applying default theme: " + R.style.default_theme);
 			styleId = R.style.default_theme;
 		} else {
-			Log.d(this.getClass().getName(), "Saved them found: " + styleId);
+			Log.d(this.getClass().getName(), "Saved theme found: " + styleId);
 		}
 
 		setTheme(styleId);
 	}
 
+	@NotNull
+	private static Map<String, Integer> getCache(@NotNull Class<?> clazz) {
+		Map<String, Integer> result = caches.get(clazz);
+
+		if (result == null) {
+			result = new HashMap<String, Integer>();
+
+			for (Field field : clazz.getDeclaredFields()) {
+				int modifiers = field.getModifiers();
+				if (Modifier.isFinal(modifiers) && Modifier.isStatic(modifiers)) {
+					try {
+						result.put(field.getName(), field.getInt(R.style.class));
+					} catch (IllegalAccessException e) {
+						Log.e(CalculatorActivity.class.getName(), e.getMessage());
+					}
+				}
+			}
+
+			caches.put(clazz, result);
+		}
+
+		return result;
+	}
+
 	private synchronized void firstTimeInit(@NotNull SharedPreferences preferences) {
 		if (!initialized) {
 			try {
@@ -390,8 +419,9 @@ public class CalculatorActivity extends Activity implements FontSizeAdjuster, Sh
 
 		final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
 
+		final String newLayoutName = preferences.getString(getString(R.string.p_calc_layout_key), getString(R.string.p_calc_layout));
 		final String newThemeName = preferences.getString(getString(R.string.p_calc_theme_key), getString(R.string.p_calc_theme));
-		if (!newThemeName.equals(themeName)) {
+		if (!themeName.equals(newThemeName) || !layoutName.equals(newLayoutName)) {
 			restart();
 		}