diff --git a/src/com/android/contacts/CallDetailActivity.java b/src/com/android/contacts/CallDetailActivity.java
index ac26494..428e2e8 100644
--- a/src/com/android/contacts/CallDetailActivity.java
+++ b/src/com/android/contacts/CallDetailActivity.java
@@ -25,6 +25,7 @@
 import com.android.contacts.format.FormatUtils;
 import com.android.contacts.util.AsyncTaskExecutor;
 import com.android.contacts.util.AsyncTaskExecutors;
+import com.android.contacts.util.Constants;
 import com.android.contacts.voicemail.VoicemailPlaybackFragment;
 import com.android.contacts.voicemail.VoicemailStatusHelper;
 import com.android.contacts.voicemail.VoicemailStatusHelper.StatusMessage;
@@ -333,7 +334,7 @@
                         getSystemService(Context.TELEPHONY_SERVICE);
                 if (tm.getCallState() == TelephonyManager.CALL_STATE_IDLE) {
                     startActivity(ContactsUtils.getCallIntent(
-                            Uri.fromParts("tel", mNumber, null)));
+                            Uri.fromParts(Constants.SCHEME_TEL, mNumber, null)));
                     return true;
                 }
             }
diff --git a/src/com/android/contacts/ContactsUtils.java b/src/com/android/contacts/ContactsUtils.java
index f7afd22..687bd0d 100644
--- a/src/com/android/contacts/ContactsUtils.java
+++ b/src/com/android/contacts/ContactsUtils.java
@@ -22,6 +22,7 @@
 import com.android.contacts.model.AccountTypeManager;
 import com.android.contacts.model.AccountWithDataSet;
 import com.android.contacts.test.NeededForTesting;
+import com.android.contacts.util.Constants;
 import com.android.i18n.phonenumbers.PhoneNumberUtil;
 
 import android.content.Context;
@@ -224,9 +225,9 @@
             return Uri.parse("voicemail:");
         }
         if (PhoneNumberUtils.isUriNumber(number)) {
-             return Uri.fromParts("sip", number, null);
+             return Uri.fromParts(Constants.SCHEME_SIP, number, null);
         }
-        return Uri.fromParts("tel", number, null);
+        return Uri.fromParts(Constants.SCHEME_TEL, number, null);
      }
 
     /**
diff --git a/src/com/android/contacts/activities/DialtactsActivity.java b/src/com/android/contacts/activities/DialtactsActivity.java
index d81e1ee..9872ad4 100644
--- a/src/com/android/contacts/activities/DialtactsActivity.java
+++ b/src/com/android/contacts/activities/DialtactsActivity.java
@@ -29,6 +29,7 @@
 import com.android.contacts.list.PhoneNumberPickerFragment;
 import com.android.contacts.activities.TransactionSafeActivity;
 import com.android.contacts.util.AccountFilterUtil;
+import com.android.contacts.util.Constants;
 import com.android.internal.telephony.ITelephony;
 
 import android.app.ActionBar;
@@ -721,7 +722,7 @@
         }
         if (Intent.ACTION_VIEW.equals(action)) {
             final Uri data = intent.getData();
-            if (data != null && "tel".equals(data.getScheme())) {
+            if (data != null && Constants.SCHEME_TEL.equals(data.getScheme())) {
                 return true;
             }
         }
diff --git a/src/com/android/contacts/activities/NonPhoneActivity.java b/src/com/android/contacts/activities/NonPhoneActivity.java
index 3a54292..47ae020 100644
--- a/src/com/android/contacts/activities/NonPhoneActivity.java
+++ b/src/com/android/contacts/activities/NonPhoneActivity.java
@@ -18,6 +18,7 @@
 
 import com.android.contacts.ContactsActivity;
 import com.android.contacts.R;
+import com.android.contacts.util.Constants;
 
 import android.app.Activity;
 import android.app.AlertDialog;
@@ -56,7 +57,7 @@
         final Uri data = getIntent().getData();
         if (data == null) return null;
         final String scheme = data.getScheme();
-        if (!"tel".equals(scheme)) return null;
+        if (!Constants.SCHEME_TEL.equals(scheme)) return null;
         return getIntent().getData().getSchemeSpecificPart();
     }
 
diff --git a/src/com/android/contacts/calllog/CallLogFragment.java b/src/com/android/contacts/calllog/CallLogFragment.java
index 9e52b4f..059436b 100644
--- a/src/com/android/contacts/calllog/CallLogFragment.java
+++ b/src/com/android/contacts/calllog/CallLogFragment.java
@@ -19,6 +19,7 @@
 import com.android.common.io.MoreCloseables;
 import com.android.contacts.ContactsUtils;
 import com.android.contacts.R;
+import com.android.contacts.util.Constants;
 import com.android.contacts.util.EmptyLoader;
 import com.android.contacts.voicemail.VoicemailStatusHelper;
 import com.android.contacts.voicemail.VoicemailStatusHelper.StatusMessage;
@@ -323,7 +324,8 @@
             Intent intent;
             // If "number" is really a SIP address, construct a sip: URI.
             if (PhoneNumberUtils.isUriNumber(number)) {
-                intent = ContactsUtils.getCallIntent(Uri.fromParts("sip", number, null));
+                intent = ContactsUtils.getCallIntent(
+                        Uri.fromParts(Constants.SCHEME_SIP, number, null));
             } else {
                 // We're calling a regular PSTN phone number.
                 // Construct a tel: URI, but do some other possible cleanup first.
@@ -335,7 +337,8 @@
                     String countryIso = cursor.getString(CallLogQuery.COUNTRY_ISO);
                     number = mAdapter.getBetterNumberFromContacts(number, countryIso);
                 }
-                intent = ContactsUtils.getCallIntent(Uri.fromParts("tel", number, null));
+                intent = ContactsUtils.getCallIntent(
+                        Uri.fromParts(Constants.SCHEME_TEL, number, null));
             }
             intent.setFlags(
                     Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
diff --git a/src/com/android/contacts/dialpad/DialpadFragment.java b/src/com/android/contacts/dialpad/DialpadFragment.java
index 47d4f9f..1087ecc 100644
--- a/src/com/android/contacts/dialpad/DialpadFragment.java
+++ b/src/com/android/contacts/dialpad/DialpadFragment.java
@@ -20,6 +20,7 @@
 import com.android.contacts.R;
 import com.android.contacts.SpecialCharSequenceMgr;
 import com.android.contacts.activities.DialtactsActivity;
+import com.android.contacts.util.Constants;
 import com.android.contacts.util.PhoneNumberFormatter;
 import com.android.internal.telephony.ITelephony;
 import com.android.phone.CallLogAsync;
@@ -325,7 +326,7 @@
         if (Intent.ACTION_DIAL.equals(action) || Intent.ACTION_VIEW.equals(action)) {
             Uri uri = intent.getData();
             if (uri != null) {
-                if ("tel".equals(uri.getScheme())) {
+                if (Constants.SCHEME_TEL.equals(uri.getScheme())) {
                     // Put the requested number into the input area
                     String data = uri.getSchemeSpecificPart();
                     setFormattedDigits(data, null);