diff --git a/vector/src/main/java/im/vector/app/core/di/SingletonModule.kt b/vector/src/main/java/im/vector/app/core/di/SingletonModule.kt
index bc0bccfa1b..cbd34fa05b 100644
--- a/vector/src/main/java/im/vector/app/core/di/SingletonModule.kt
+++ b/vector/src/main/java/im/vector/app/core/di/SingletonModule.kt
@@ -21,6 +21,7 @@ import android.content.Context
 import android.content.Context.MODE_PRIVATE
 import android.content.SharedPreferences
 import android.content.res.Resources
+import com.google.i18n.phonenumbers.PhoneNumberUtil
 import dagger.Binds
 import dagger.Module
 import dagger.Provides
@@ -193,6 +194,9 @@ object VectorStaticModule {
         return analyticsConfig
     }
 
+    @Provides
+    fun providesPhoneNumberUtil(): PhoneNumberUtil = PhoneNumberUtil.getInstance()
+
     @Provides
     @Singleton
     fun providesBuildMeta() = BuildMeta()
diff --git a/vector/src/main/java/im/vector/app/features/onboarding/ftueauth/PhoneNumberParser.kt b/vector/src/main/java/im/vector/app/features/onboarding/ftueauth/PhoneNumberParser.kt
index 3858f9d5b4..eb108d3c47 100644
--- a/vector/src/main/java/im/vector/app/features/onboarding/ftueauth/PhoneNumberParser.kt
+++ b/vector/src/main/java/im/vector/app/features/onboarding/ftueauth/PhoneNumberParser.kt
@@ -20,7 +20,9 @@ import com.google.i18n.phonenumbers.NumberParseException
 import com.google.i18n.phonenumbers.PhoneNumberUtil
 import javax.inject.Inject
 
-class PhoneNumberParser @Inject constructor() {
+class PhoneNumberParser @Inject constructor(
+        private val phoneNumberUtil: PhoneNumberUtil
+) {
 
     fun parseInternationalNumber(rawPhoneNumber: String): Result {
         return when {
@@ -30,9 +32,8 @@ class PhoneNumberParser @Inject constructor() {
     }
 
     private fun parseNumber(rawPhoneNumber: String) = try {
-        val instance = PhoneNumberUtil.getInstance()
-        val phoneNumber = instance.parse(rawPhoneNumber, null)
-        Result.Success(instance.getRegionCodeForCountryCode(phoneNumber.countryCode), rawPhoneNumber)
+        val phoneNumber = phoneNumberUtil.parse(rawPhoneNumber, null)
+        Result.Success(phoneNumberUtil.getRegionCodeForCountryCode(phoneNumber.countryCode), rawPhoneNumber)
     } catch (e: NumberParseException) {
         Result.ErrorInvalidNumber
     }
diff --git a/vector/src/test/java/im/vector/app/features/onboarding/ftueauth/PhoneNumberParserTest.kt b/vector/src/test/java/im/vector/app/features/onboarding/ftueauth/PhoneNumberParserTest.kt
new file mode 100644
index 0000000000..1249cb15d1
--- /dev/null
+++ b/vector/src/test/java/im/vector/app/features/onboarding/ftueauth/PhoneNumberParserTest.kt
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2022 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.features.onboarding.ftueauth
+
+import im.vector.app.test.fakes.FakePhoneNumberUtil
+import org.amshove.kluent.shouldBeEqualTo
+import org.junit.Test
+
+private const val AN_INTERNATIONAL_PHONE_NUMBER = "+4411111111111"
+private const val A_NON_INTERNATIONAL_PHONE_NUMBER = "111111111111"
+private const val AN_INVALID_INTERNATIONAL_NUMBER = "+abc"
+private const val A_COUNTRY_CODE = "GB"
+private const val A_COUNTRY_CALLING_CODE = 44
+
+class PhoneNumberParserTest {
+
+    private val fakePhoneNumberUtil = FakePhoneNumberUtil()
+    private val phoneNumberParser = PhoneNumberParser(fakePhoneNumberUtil.instance)
+
+    @Test
+    fun `given a calling code and country code are successfully read when parsing, then returns success with country code`() {
+        fakePhoneNumberUtil.givenCountryCallingCodeFor(AN_INTERNATIONAL_PHONE_NUMBER, callingCode = A_COUNTRY_CALLING_CODE)
+        fakePhoneNumberUtil.givenRegionCodeFor(A_COUNTRY_CALLING_CODE, countryCode = A_COUNTRY_CODE)
+
+        val result = phoneNumberParser.parseInternationalNumber(AN_INTERNATIONAL_PHONE_NUMBER)
+
+        result shouldBeEqualTo PhoneNumberParser.Result.Success(A_COUNTRY_CODE, AN_INTERNATIONAL_PHONE_NUMBER)
+    }
+
+    @Test
+    fun `given a non internation phone number, when parsing, then returns MissingInternationCode error`() {
+        val result = phoneNumberParser.parseInternationalNumber(A_NON_INTERNATIONAL_PHONE_NUMBER)
+
+        result shouldBeEqualTo PhoneNumberParser.Result.ErrorMissingInternationalCode
+    }
+
+    @Test
+    fun `given an invalid phone number, when parsing, then returns ErrorInvalidNumber error`() {
+        fakePhoneNumberUtil.givenFailsToParse(AN_INVALID_INTERNATIONAL_NUMBER)
+
+        val result = phoneNumberParser.parseInternationalNumber(AN_INVALID_INTERNATIONAL_NUMBER)
+
+        result shouldBeEqualTo PhoneNumberParser.Result.ErrorInvalidNumber
+    }
+}
diff --git a/vector/src/test/java/im/vector/app/test/fakes/FakePhoneNumberUtil.kt b/vector/src/test/java/im/vector/app/test/fakes/FakePhoneNumberUtil.kt
new file mode 100644
index 0000000000..b4318635a6
--- /dev/null
+++ b/vector/src/test/java/im/vector/app/test/fakes/FakePhoneNumberUtil.kt
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2022 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package im.vector.app.test.fakes
+
+import com.google.i18n.phonenumbers.NumberParseException
+import com.google.i18n.phonenumbers.PhoneNumberUtil
+import com.google.i18n.phonenumbers.Phonenumber
+import io.mockk.every
+import io.mockk.mockk
+
+class FakePhoneNumberUtil {
+
+    val instance = mockk<PhoneNumberUtil>()
+
+    fun givenCountryCallingCodeFor(phoneNumber: String, callingCode: Int) {
+        every { instance.parse(phoneNumber, null) } returns Phonenumber.PhoneNumber().setCountryCode(callingCode)
+    }
+
+    fun givenRegionCodeFor(callingCode: Int, countryCode: String) {
+        every { instance.getRegionCodeForCountryCode(callingCode) } returns countryCode
+    }
+
+    fun givenFailsToParse(phoneNumber: String) {
+        every { instance.parse(phoneNumber, null) } throws NumberParseException(NumberParseException.ErrorType.NOT_A_NUMBER, "")
+    }
+}