diff --git a/src/.idea/deploymentTargetDropDown.xml b/src/.idea/deploymentTargetDropDown.xml
index 28cc420..d452729 100644
--- a/src/.idea/deploymentTargetDropDown.xml
+++ b/src/.idea/deploymentTargetDropDown.xml
@@ -12,6 +12,6 @@
         </deviceKey>
       </Target>
     </targetSelectedWithDropDown>
-    <timeTargetWasSelectedWithDropDown value="2022-09-29T21:08:01.717115Z" />
+    <timeTargetWasSelectedWithDropDown value="2022-10-25T19:37:19.859988Z" />
   </component>
 </project>
\ No newline at end of file
diff --git a/src/app/build.gradle b/src/app/build.gradle
index 0510dc8..18da622 100644
--- a/src/app/build.gradle
+++ b/src/app/build.gradle
@@ -3,14 +3,14 @@ plugins {
 }
 
 android {
-    compileSdk 32
+    compileSdk 33
 
     defaultConfig {
         applicationId "com.xfarrow.locatemydevice"
         minSdk 28
-        targetSdk 32
+        targetSdk 33
         versionCode 2
-        versionName "1.0"
+        versionName "1.0.1"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -31,9 +31,9 @@ android {
 }
 
 dependencies {
-
     implementation 'androidx.appcompat:appcompat:1.5.1'
-    implementation 'com.google.android.material:material:1.6.1'
+    implementation 'com.google.android.material:material:1.7.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'com.googlecode.libphonenumber:libphonenumber:8.12.57'
 
 }
\ No newline at end of file
diff --git a/src/app/src/main/java/com/xfarrow/locatemydevice/Utils.java b/src/app/src/main/java/com/xfarrow/locatemydevice/Utils.java
index bdb88b8..a9f3d96 100644
--- a/src/app/src/main/java/com/xfarrow/locatemydevice/Utils.java
+++ b/src/app/src/main/java/com/xfarrow/locatemydevice/Utils.java
@@ -2,8 +2,12 @@ package com.xfarrow.locatemydevice;
 
 import android.telephony.SmsManager;
 
+import androidx.annotation.Nullable;
+
+import com.google.i18n.phonenumbers.NumberParseException;
+import com.google.i18n.phonenumbers.PhoneNumberUtil;
+import com.google.i18n.phonenumbers.Phonenumber;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Locale;
 
 public class Utils {
@@ -43,4 +47,16 @@ public class Utils {
                 .append("https://www.openstreetmap.org/?mlat=").append(latitude).append("&mlon=").append(longitude).toString();
     }
 
+    @Nullable
+    public static String extractCountryCodeFromPhoneNumber(String phoneNumber){
+        PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
+        Phonenumber.PhoneNumber numberProto;
+        try {
+            numberProto = phoneUtil.parse(phoneNumber, "");
+        } catch (NumberParseException e) {
+            return null;
+        }
+        return String.valueOf(numberProto.getCountryCode());
+    }
+
 }
diff --git a/src/app/src/main/java/com/xfarrow/locatemydevice/WhitelistDbHandler.java b/src/app/src/main/java/com/xfarrow/locatemydevice/WhitelistDbHandler.java
index 64f7a42..ade85dd 100644
--- a/src/app/src/main/java/com/xfarrow/locatemydevice/WhitelistDbHandler.java
+++ b/src/app/src/main/java/com/xfarrow/locatemydevice/WhitelistDbHandler.java
@@ -71,9 +71,32 @@ public class WhitelistDbHandler extends SQLiteOpenHelper {
         return array_list;
     }
 
+    /*
+    * Checks if a contact is already in the database.
+    *
+    * If a phoneNumber with an international country code is provided, checks if exists the same
+    * number without the country code. This is very useful if the user stores in the whitelist a
+    * number without the international country code because it'll be checked against the SMS sender's
+    * number obtained from the Broadcast, always containing an international country code.
+    */
     public boolean isContactPresent(String phoneNo){
         SQLiteDatabase db = this.getWritableDatabase();
-        String query = "Select * from " + TABLE_CONTACTS + " where " + KEY_PH_NO + " = " + "\"" + phoneNo + "\"";
+        // SELECT KEY_PH_NO FROM TABLE_CONTACTS WHERE KEY_PH_NO = "phoneNo" OR KEY_PH_NO = "phoneNumberWithoutPrefix"
+        String query = String.format("SELECT %s FROM %s WHERE %s = \"%s\"",
+                KEY_PH_NO,
+                TABLE_CONTACTS,
+                KEY_PH_NO,
+                phoneNo
+                );
+
+        String countryCode = Utils.extractCountryCodeFromPhoneNumber(phoneNo);
+        if(countryCode != null){
+            String phoneNumberWithoutPrefix = phoneNo.replace("+", "").replace(countryCode, "");
+            query += String.format(" OR %s = \"%s\"",
+                    KEY_PH_NO,
+                    phoneNumberWithoutPrefix);
+        }
+
         Cursor cursor = db.rawQuery(query, null);
         int count = cursor.getCount();
         cursor.close();