diff --git a/src/com/android/settings/DataUsageSummary.java b/src/com/android/settings/DataUsageSummary.java
index ce8f291..b06dc28 100644
--- a/src/com/android/settings/DataUsageSummary.java
+++ b/src/com/android/settings/DataUsageSummary.java
@@ -151,7 +151,9 @@
     // TODO: remove this testing code
     private static final boolean TEST_ANIM = false;
     private static final boolean TEST_RADIOS = false;
+
     private static final String TEST_RADIOS_PROP = "test.radios";
+    private static final String TEST_SUBSCRIBER_PROP = "test.subscriberid";
 
     private static final String TAB_3G = "3g";
     private static final String TAB_4G = "4g";
@@ -1217,7 +1219,8 @@
     private static String getActiveSubscriberId(Context context) {
         final TelephonyManager telephony = (TelephonyManager) context.getSystemService(
                 Context.TELEPHONY_SERVICE);
-        return telephony.getSubscriberId();
+        final String actualSubscriberId = telephony.getSubscriberId();
+        return SystemProperties.get(TEST_SUBSCRIBER_PROP, actualSubscriberId);
     }
 
     private DataUsageChartListener mChartListener = new DataUsageChartListener() {
diff --git a/src/com/android/settings/widget/ChartDataUsageView.java b/src/com/android/settings/widget/ChartDataUsageView.java
index 28fbd00..4b4f37d 100644
--- a/src/com/android/settings/widget/ChartDataUsageView.java
+++ b/src/com/android/settings/widget/ChartDataUsageView.java
@@ -29,6 +29,7 @@
 import android.text.SpannableStringBuilder;
 import android.text.TextUtils;
 import android.text.format.DateUtils;
+import android.text.format.Time;
 import android.util.AttributeSet;
 import android.view.MotionEvent;
 import android.view.View;
@@ -37,6 +38,9 @@
 import com.android.settings.R;
 import com.android.settings.widget.ChartSweepView.OnSweepListener;
 
+import java.util.Arrays;
+import java.util.Calendar;
+
 /**
  * Specific {@link ChartView} that displays {@link ChartNetworkSeriesView} along
  * with {@link ChartSweepView} for inspection ranges and warning/limits.
@@ -449,7 +453,7 @@
     }
 
     public static class TimeAxis implements ChartAxis {
-        private static final long TICK_INTERVAL = DateUtils.DAY_IN_MILLIS * 7;
+        private static final int FIRST_DAY_OF_WEEK = Calendar.getInstance().getFirstDayOfWeek() - 1;
 
         private long mMin;
         private long mMax;
@@ -505,13 +509,27 @@
 
         /** {@inheritDoc} */
         public float[] getTickPoints() {
-            // tick mark for every week
-            final int tickCount = (int) ((mMax - mMin) / TICK_INTERVAL);
-            final float[] tickPoints = new float[tickCount];
-            for (int i = 0; i < tickCount; i++) {
-                tickPoints[i] = convertToPoint(mMax - (TICK_INTERVAL * (i + 1)));
+            final float[] ticks = new float[32];
+            int i = 0;
+
+            // tick mark for first day of each week
+            final Time time = new Time();
+            time.set(mMax);
+            time.monthDay -= time.weekDay - FIRST_DAY_OF_WEEK;
+            time.hour = time.minute = time.second = 0;
+
+            time.normalize(true);
+            long timeMillis = time.toMillis(true);
+            while (timeMillis > mMin) {
+                if (timeMillis <= mMax) {
+                    ticks[i++] = convertToPoint(timeMillis);
+                }
+                time.monthDay -= 7;
+                time.normalize(true);
+                timeMillis = time.toMillis(true);
             }
-            return tickPoints;
+
+            return Arrays.copyOf(ticks, i);
         }
 
         /** {@inheritDoc} */
@@ -526,6 +544,8 @@
         private long mMax;
         private float mSize;
 
+        private static final boolean LOG_SCALE = false;
+
         @Override
         public int hashCode() {
             return Objects.hashCode(mMin, mMax, mSize);
@@ -554,19 +574,27 @@
 
         /** {@inheritDoc} */
         public float convertToPoint(long value) {
-            // derived polynomial fit to make lower values more visible
-            final double normalized = ((double) value - mMin) / (mMax - mMin);
-            final double fraction = Math.pow(
-                    10, 0.36884343106175121463 * Math.log10(normalized) + -0.04328199452018252624);
-            return (float) (fraction * mSize);
+            if (LOG_SCALE) {
+                // derived polynomial fit to make lower values more visible
+                final double normalized = ((double) value - mMin) / (mMax - mMin);
+                final double fraction = Math.pow(10,
+                        0.36884343106175121463 * Math.log10(normalized) + -0.04328199452018252624);
+                return (float) (fraction * mSize);
+            } else {
+                return (mSize * (value - mMin)) / (mMax - mMin);
+            }
         }
 
         /** {@inheritDoc} */
         public long convertToValue(float point) {
-            final double normalized = point / mSize;
-            final double fraction = 1.3102228476089056629
-                    * Math.pow(normalized, 2.7111774693164631640);
-            return (long) (mMin + (fraction * (mMax - mMin)));
+            if (LOG_SCALE) {
+                final double normalized = point / mSize;
+                final double fraction = 1.3102228476089056629
+                        * Math.pow(normalized, 2.7111774693164631640);
+                return (long) (mMin + (fraction * (mMax - mMin)));
+            } else {
+                return (long) (mMin + ((point * (mMax - mMin)) / mSize));
+            }
         }
 
         private static final Object sSpanSize = new Object();