diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/AuthenticationState.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/AuthenticationState.cs
index 78c701a64..4aba50406 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/AuthenticationState.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/AuthenticationState.cs
@@ -108,6 +108,8 @@ public AuthenticationState(
     [JsonInclude]
     public bool MobileNumberVerified { get; private set; }
     [JsonInclude]
+    public bool ContinueWithoutMobileNumber { get; private set; }
+    [JsonInclude]
     public Guid? ExistingAccountUserId { get; private set; }
     [JsonInclude]
     public string? ExistingAccountEmail { get; private set; }
@@ -162,7 +164,9 @@ public AuthenticationState(
     [JsonIgnore]
     public bool HasIttProviderSet => HasIttProvider.HasValue;
     [JsonIgnore]
-    public bool ContactDetailsVerified => EmailAddressVerified && MobileNumberVerified;
+    public bool ContactDetailsVerified => EmailAddressVerified && MobileNumberVerifiedOrSkipped;
+    [JsonIgnore]
+    public bool MobileNumberVerifiedOrSkipped => MobileNumberVerified || ContinueWithoutMobileNumber;
     [JsonIgnore]
     public bool HasTrnToken => !string.IsNullOrEmpty(TrnToken);
     [JsonIgnore]
@@ -242,6 +246,7 @@ public void Reset(DateTime utcNow)
         HasPreviousName = default;
         MobileNumber = default;
         MobileNumberVerified = default;
+        ContinueWithoutMobileNumber = default;
         ExistingAccountUserId = default;
         ExistingAccountEmail = default;
         ExistingAccountMobileNumber = default;
@@ -313,6 +318,7 @@ public void OnMobileNumberVerified(User? user = null)
 
         MobileNumberVerified = true;
         FirstTimeSignInForEmail = user is null;
+        ContinueWithoutMobileNumber = false;
 
         if (user is not null)
         {
@@ -390,12 +396,12 @@ public void OnUserRegistered(User user)
             throw new InvalidOperationException($"Email has not been verified.");
         }
 
-        if (MobileNumber is null)
+        if (MobileNumber is null && !ContinueWithoutMobileNumber)
         {
             throw new InvalidOperationException($"{nameof(MobileNumber)} is not known.");
         }
 
-        if (!MobileNumberSet)
+        if (!MobileNumberVerified && !ContinueWithoutMobileNumber)
         {
             throw new InvalidOperationException($"Mobile number has not been verified.");
         }
@@ -565,6 +571,14 @@ public void OnMobileNumberSet(string mobileNumber)
     {
         MobileNumber = mobileNumber;
         MobileNumberVerified = false;
+        ContinueWithoutMobileNumber = false;
+    }
+
+    public void OnContinueWithoutMobileNumber()
+    {
+        MobileNumber = null;
+        MobileNumberVerified = false;
+        ContinueWithoutMobileNumber = true;
     }
 
     public void OnHaveResumedCompletedJourney()
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/IdentityLinkGenerator.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/IdentityLinkGenerator.cs
index 16d825952..57e0cccce 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/IdentityLinkGenerator.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/IdentityLinkGenerator.cs
@@ -23,14 +23,14 @@ protected IdentityLinkGenerator(
 
     protected abstract bool TryGetAuthenticationState([NotNullWhen(true)] out AuthenticationState? authenticationState);
 
-    protected virtual string Page(string pageName, bool authenticationJourneyRequired = true)
+    protected virtual string Page(string pageName, string? handler = null, bool authenticationJourneyRequired = true)
     {
         if (!TryGetAuthenticationState(out var authenticationState) && authenticationJourneyRequired)
         {
             throw new InvalidOperationException($"The current request has no {nameof(AuthenticationState)}.");
         }
 
-        var url = new Url(LinkGenerator.GetPathByPage(pageName));
+        var url = new Url(LinkGenerator.GetPathByPage(pageName, handler));
 
         if (authenticationState is not null)
         {
@@ -78,6 +78,8 @@ protected virtual string Page(string pageName, bool authenticationJourneyRequire
 
     public string RegisterPhone() => Page("/SignIn/Register/Phone");
 
+    public string RegisterPhoneContinueWithout() => Page("/SignIn/Register/Phone", handler: "ContinueWithout");
+
     public string RegisterPhoneConfirmation() => Page("/SignIn/Register/PhoneConfirmation");
 
     public string RegisterResendPhoneConfirmation() => Page("/SignIn/Register/ResendPhoneConfirmation");
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/CoreSignInJourney.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/CoreSignInJourney.cs
index c6d623cc0..aa3566875 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/CoreSignInJourney.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/CoreSignInJourney.cs
@@ -85,6 +85,7 @@ public override string GetLastAccessibleStepUrl(string? requestedStep)
             (Steps.ResendEmailConfirmation, _) => Steps.EmailConfirmation,
             (Steps.InstitutionEmail, { EmailAddressVerified: false }) => Steps.EmailConfirmation,
             (Steps.InstitutionEmail, { EmailAddressVerified: true }) => shouldCheckAnswers ? Steps.CheckAnswers : Steps.Phone,
+            (Steps.Phone, { ContinueWithoutMobileNumber: true }) => shouldCheckAnswers ? Steps.CheckAnswers : Steps.Name,
             (Steps.Phone, _) => Steps.PhoneConfirmation,
             (Steps.PhoneConfirmation, { UserId: not null }) => Steps.PhoneExists,
             (Steps.PhoneConfirmation, _) => shouldCheckAnswers ? Steps.CheckAnswers : Steps.Name,
@@ -123,6 +124,7 @@ public override string GetLastAccessibleStepUrl(string? requestedStep)
         (Steps.ResendPhoneConfirmation, _) => Steps.PhoneConfirmation,
         (Steps.PhoneExists, { MobileNumberVerified: true }) => Steps.Phone,
         (Steps.PhoneExists, { MobileNumberVerified: false }) => Steps.PhoneConfirmation,
+        (Steps.Name, { ContinueWithoutMobileNumber: true }) => Steps.Phone,
         (Steps.Name, { MobileNumberVerified: true }) => Steps.Phone,
         (Steps.Name, { MobileNumberVerified: false }) => Steps.PhoneConfirmation,
         (Steps.PreferredName, _) => Steps.Name,
@@ -175,9 +177,8 @@ AuthenticationState is
         {
             EmailAddressSet: true,
             EmailAddressVerified: true,
+            MobileNumberVerifiedOrSkipped: true,
             HasValidEmail: true,
-            MobileNumberSet: true,
-            MobileNumberVerified: true,
             NameSet: true,
             PreferredNameSet: true,
             DateOfBirthSet: true,
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/TrnTokenSignInJourney.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/TrnTokenSignInJourney.cs
index 52c2926d2..5727fb107 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/TrnTokenSignInJourney.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/TrnTokenSignInJourney.cs
@@ -72,10 +72,10 @@ public override bool CanAccessStep(string step)
             CoreSignInJourney.Steps.PhoneConfirmation => AuthenticationState is { MobileNumberSet: true, MobileNumberVerified: false, EmailAddressVerified: true },
             CoreSignInJourney.Steps.PhoneExists => AuthenticationState.UserId is not null,
             CoreSignInJourney.Steps.ResendPhoneConfirmation => AuthenticationState is { MobileNumberSet: true, MobileNumberVerified: false },
-            CoreSignInJourney.Steps.Email => AuthenticationState.MobileNumberVerified,
-            CoreSignInJourney.Steps.EmailConfirmation => AuthenticationState is { EmailAddressSet: true, EmailAddressVerified: false, MobileNumberVerified: true },
+            CoreSignInJourney.Steps.Email => AuthenticationState.MobileNumberVerifiedOrSkipped,
+            CoreSignInJourney.Steps.EmailConfirmation => AuthenticationState is { EmailAddressSet: true, EmailAddressVerified: false, MobileNumberVerifiedOrSkipped: true },
             CoreSignInJourney.Steps.ResendEmailConfirmation => AuthenticationState is { EmailAddressSet: true, EmailAddressVerified: false },
-            CoreSignInJourney.Steps.InstitutionEmail => AuthenticationState is { EmailAddressSet: true, EmailAddressVerified: true, MobileNumberVerified: true, IsInstitutionEmail: true },
+            CoreSignInJourney.Steps.InstitutionEmail => AuthenticationState is { EmailAddressSet: true, EmailAddressVerified: true, MobileNumberVerifiedOrSkipped: true, IsInstitutionEmail: true },
             CoreSignInJourney.Steps.PreferredName => AuthenticationState.ContactDetailsVerified,
             CoreSignInJourney.Steps.DateOfBirth => AuthenticationState is { PreferredNameSet: true, ContactDetailsVerified: true },
             CoreSignInJourney.Steps.AccountExists => AuthenticationState.ExistingAccountFound,
@@ -99,6 +99,7 @@ public override bool CanAccessStep(string step)
             (SignInJourney.Steps.Email, _) => SignInJourney.Steps.EmailConfirmation,
             (SignInJourney.Steps.EmailConfirmation, { UserId: not null }) => CoreSignInJourney.Steps.EmailExists,
             (SignInJourney.Steps.EmailConfirmation, _) => shouldCheckAnswers ? Steps.CheckAnswers : CoreSignInJourney.Steps.Phone,
+            (CoreSignInJourney.Steps.Phone, { ContinueWithoutMobileNumber: true }) => shouldCheckAnswers ? Steps.CheckAnswers : CoreSignInJourney.Steps.PreferredName,
             (CoreSignInJourney.Steps.Phone, _) => CoreSignInJourney.Steps.PhoneConfirmation,
             (CoreSignInJourney.Steps.PhoneConfirmation, { UserId: not null }) => CoreSignInJourney.Steps.PhoneExists,
             (CoreSignInJourney.Steps.PhoneConfirmation, _) => shouldCheckAnswers ? Steps.CheckAnswers : CoreSignInJourney.Steps.PreferredName,
@@ -138,6 +139,7 @@ public override bool CanAccessStep(string step)
         (CoreSignInJourney.Steps.ResendEmailConfirmation, _) => CoreSignInJourney.Steps.EmailConfirmation,
         (CoreSignInJourney.Steps.InstitutionEmail, { EmailAddressVerified: false }) => CoreSignInJourney.Steps.EmailConfirmation,
         (CoreSignInJourney.Steps.InstitutionEmail, { EmailAddressVerified: true }) => CoreSignInJourney.Steps.Email,
+        (CoreSignInJourney.Steps.PreferredName, { ContinueWithoutMobileNumber: true }) => CoreSignInJourney.Steps.Phone,
         (CoreSignInJourney.Steps.PreferredName, { MobileNumberVerified: true }) => CoreSignInJourney.Steps.Phone,
         (CoreSignInJourney.Steps.PreferredName, { MobileNumberVerified: false }) => CoreSignInJourney.Steps.PhoneConfirmation,
         (CoreSignInJourney.Steps.DateOfBirth, _) => CoreSignInJourney.Steps.PreferredName,
@@ -160,9 +162,8 @@ AuthenticationState is
         {
             EmailAddressSet: true,
             EmailAddressVerified: true,
+            MobileNumberVerifiedOrSkipped: true,
             HasValidEmail: true,
-            MobileNumberSet: true,
-            MobileNumberVerified: true,
             NameSet: true,
             PreferredNameSet: true,
             DateOfBirthSet: true,
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/UserHelper.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/UserHelper.cs
index f5a49b821..95f8ada58 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/UserHelper.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Journeys/UserHelper.cs
@@ -53,7 +53,7 @@ public async Task<User> CreateUser(AuthenticationState authenticationState)
             DateOfBirth = authenticationState.DateOfBirth,
             EmailAddress = authenticationState.EmailAddress!,
             MobileNumber = authenticationState.MobileNumber,
-            NormalizedMobileNumber = MobileNumber.Parse(authenticationState.MobileNumber!),
+            NormalizedMobileNumber = authenticationState.MobileNumber is not null ? MobileNumber.Parse(authenticationState.MobileNumber) : null,
             FirstName = authenticationState.FirstName!,
             MiddleName = authenticationState.MiddleName,
             LastName = authenticationState.LastName!,
@@ -94,6 +94,7 @@ public async Task<User> CreateUserWithTrnLookup(AuthenticationState authenticati
             DateOfBirth = authenticationState.DateOfBirth,
             EmailAddress = authenticationState.EmailAddress!,
             MobileNumber = authenticationState.MobileNumber,
+            NormalizedMobileNumber = authenticationState.MobileNumber is not null ? MobileNumber.Parse(authenticationState.MobileNumber) : null,
             FirstName = useDqtRecordForNames ? authenticationState.DqtFirstName! : authenticationState.FirstName!,
             MiddleName = useDqtRecordForNames ? authenticationState.DqtMiddleName : authenticationState.MiddleName,
             LastName = useDqtRecordForNames ? authenticationState.DqtLastName! : authenticationState.LastName!,
@@ -140,6 +141,7 @@ public async Task<User> CreateUserWithTrnToken(AuthenticationState authenticatio
             DateOfBirth = authenticationState.DateOfBirth,
             EmailAddress = authenticationState.EmailAddress!,
             MobileNumber = authenticationState.MobileNumber,
+            NormalizedMobileNumber = authenticationState.MobileNumber is not null ? MobileNumber.Parse(authenticationState.MobileNumber) : null,
             FirstName = authenticationState.FirstName!,
             MiddleName = authenticationState.MiddleName,
             LastName = authenticationState.LastName!,
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml
index c1dc233b8..d5b4a6170 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml
@@ -24,7 +24,9 @@
                 </govuk-summary-list-row>
                 <govuk-summary-list-row>
                     <govuk-summary-list-row-key>Mobile phone</govuk-summary-list-row-key>
-                    <govuk-summary-list-row-value>@Model.MobilePhoneNumber</govuk-summary-list-row-value>
+                    <govuk-summary-list-row-value>
+                        <span fallback-text="Not provided">@Model.MobilePhoneNumber</span>
+                    </govuk-summary-list-row-value>
                     <govuk-summary-list-row-actions>
                         <govuk-summary-list-row-action href="@LinkGenerator.RegisterPhone()" visually-hidden-text="mobile phone">Change</govuk-summary-list-row-action>
                     </govuk-summary-list-row-actions>
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml.cs
index 1707c603a..6bda0572f 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/CheckAnswers.cshtml.cs
@@ -22,7 +22,7 @@ public CheckAnswers(SignInJourney journey)
 
     public bool? RequiresTrnLookup => _journey.AuthenticationState.UserRequirements.RequiresTrnLookup();
     public string? EmailAddress => _journey.AuthenticationState.EmailAddress;
-    public string? MobilePhoneNumber => MobileNumber.Parse(_journey.AuthenticationState.MobileNumber!).ToDisplayString();
+    public string? MobilePhoneNumber => _journey.AuthenticationState.MobileNumber is not null ? MobileNumber.Parse(_journey.AuthenticationState.MobileNumber).ToDisplayString() : null;
     public string? FullName => _journey.AuthenticationState.GetName();
     public string? PreferredName => _journey.AuthenticationState.PreferredName;
     public DateOnly? DateOfBirth => _journey.AuthenticationState.DateOfBirth;
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml
index e806cf158..d99c61862 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml
@@ -1,4 +1,4 @@
-@page "/sign-in/register/phone"
+@page "/sign-in/register/phone/{handler?}"
 @model TeacherIdentity.AuthServer.Pages.SignIn.Register.Phone
 @{
     ViewBag.Title = "Your mobile number";
@@ -22,6 +22,15 @@
                 input-class="govuk-input--extra-letter-spacing"
                 label-class="govuk-label--s" />
 
+            <govuk-details>
+                <govuk-details-summary>I do not have access to a mobile phone</govuk-details-summary>
+                <govuk-details-text>
+                    <govuk-button type="submit" class="govuk-button--secondary" formaction="@LinkGenerator.RegisterPhoneContinueWithout()">
+                        Continue without it
+                    </govuk-button>
+                </govuk-details-text>
+            </govuk-details>
+
             <govuk-button type="submit">Continue</govuk-button>
         </form>
     </div>
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml.cs
index 2530291d0..769ed7855 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/Phone.cshtml.cs
@@ -45,7 +45,14 @@ public async Task<IActionResult> OnPost()
             return pinGenerationResult.Result!;
         }
 
-        HttpContext.GetAuthenticationState().OnMobileNumberSet(MobileNumber!);
+        _journey.AuthenticationState.OnMobileNumberSet(MobileNumber!);
+
+        return await _journey.Advance(CurrentStep);
+    }
+
+    public async Task<IActionResult> OnPostContinueWithout()
+    {
+        _journey.AuthenticationState.OnContinueWithoutMobileNumber();
 
         return await _journey.Advance(CurrentStep);
     }
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/PhoneConfirmation.cshtml b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/PhoneConfirmation.cshtml
index a61d83cbd..81e9da9b3 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/PhoneConfirmation.cshtml
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/Register/PhoneConfirmation.cshtml
@@ -23,9 +23,18 @@
                 autocomplete="one-time-code"
                 label-class="govuk-label--s" />
 
-            <p>
-                <a href="@LinkGenerator.RegisterResendPhoneConfirmation()">I have not received a text message</a>
-            </p>
+            <govuk-details>
+                <govuk-details-summary>I have not received a code</govuk-details-summary>
+                <govuk-details-text>
+                    <p>
+                        We can <a href="@LinkGenerator.RegisterResendPhoneConfirmation()">send you another code</a>
+                        or you can continue without it.
+                    </p>
+                    <govuk-button type="submit" class="govuk-button--secondary" formaction="@LinkGenerator.RegisterPhoneContinueWithout()">
+                        Continue without it
+                    </govuk-button>
+                </govuk-details-text>
+            </govuk-details>
 
             <govuk-button type="submit">Continue</govuk-button>
         </form>
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml
index 850bac76c..9665d8a4f 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml
@@ -62,7 +62,9 @@
                 </govuk-summary-list-row>
                 <govuk-summary-list-row>
                     <govuk-summary-list-row-key>Mobile phone</govuk-summary-list-row-key>
-                    <govuk-summary-list-row-value>@Model.MobilePhoneNumber</govuk-summary-list-row-value>
+                    <govuk-summary-list-row-value>
+                        <span fallback-text="Not provided">@Model.MobilePhoneNumber</span>
+                    </govuk-summary-list-row-value>
                     <govuk-summary-list-row-actions>
                         <govuk-summary-list-row-action href="" visually-hidden-text="mobile phone">Change</govuk-summary-list-row-action>
                     </govuk-summary-list-row-actions>
diff --git a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml.cs b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml.cs
index d7c2d1c3b..45fb63b7d 100644
--- a/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml.cs
+++ b/dotnet-authserver/src/TeacherIdentity.AuthServer/Pages/SignIn/TrnToken/CheckAnswers.cshtml.cs
@@ -20,7 +20,7 @@ public CheckAnswers(SignInJourney journey)
 
     public string BackLink => _journey.GetPreviousStepUrl(CurrentStep);
     public string? EmailAddress => _journey.AuthenticationState.EmailAddress;
-    public string? MobilePhoneNumber => MobileNumber.Parse(_journey.AuthenticationState.MobileNumber!).ToDisplayString();
+    public string? MobilePhoneNumber => _journey.AuthenticationState.MobileNumber is not null ? MobileNumber.Parse(_journey.AuthenticationState.MobileNumber).ToDisplayString() : null;
     public string? FirstName => _journey.AuthenticationState.FirstName;
     public string? MiddleName => _journey.AuthenticationState.MiddleName;
     public string? LastName => _journey.AuthenticationState.LastName;
diff --git a/dotnet-authserver/tests/TeacherIdentity.AuthServer.Tests/EndpointTests/SignIn/Register/PhoneTests.cs b/dotnet-authserver/tests/TeacherIdentity.AuthServer.Tests/EndpointTests/SignIn/Register/PhoneTests.cs
index c529833bf..c64de8de6 100644
--- a/dotnet-authserver/tests/TeacherIdentity.AuthServer.Tests/EndpointTests/SignIn/Register/PhoneTests.cs
+++ b/dotnet-authserver/tests/TeacherIdentity.AuthServer.Tests/EndpointTests/SignIn/Register/PhoneTests.cs
@@ -100,7 +100,6 @@ public async Task Post_ValidMobileNumberWithBlockedClient_ReturnsTooManyRequests
         Assert.Equal(StatusCodes.Status429TooManyRequests, (int)response.StatusCode);
     }
 
-
     [Fact]
     public async Task Post_EmptyMobileNumber_ReturnsError()
     {
@@ -190,6 +189,25 @@ public async Task Post_NotificationServiceInvalidMobileNumber_ReturnsError()
         await AssertEx.HtmlResponseHasError(response, "MobileNumber", "Enter a valid mobile phone number");
     }
 
+    [Fact]
+    public async Task PostContinueWithout_SetsContinueWithoutPhoneNumberOnAuthenticationStateAndRedirects()
+    {
+        // Arrange
+        var authStateHelper = await CreateAuthenticationStateHelper(_currentPageAuthenticationState(), additionalScopes: null);
+
+        var request = new HttpRequestMessage(HttpMethod.Post, $"/sign-in/register/phone/ContinueWithout?{authStateHelper.ToQueryParam()}")
+        {
+            Content = new FormUrlEncodedContentBuilder()
+        };
+
+        // Act
+        var response = await HttpClient.SendAsync(request);
+
+        // Assert
+        Assert.Equal(StatusCodes.Status302Found, (int)response.StatusCode);
+        Assert.True(authStateHelper.AuthenticationState.ContinueWithoutMobileNumber);
+    }
+
     private readonly AuthenticationStateConfigGenerator _currentPageAuthenticationState = RegisterJourneyAuthenticationStateHelper.ConfigureAuthenticationStateForPage(RegisterJourneyPage.Phone);
     private readonly AuthenticationStateConfigGenerator _previousPageAuthenticationState = RegisterJourneyAuthenticationStateHelper.ConfigureAuthenticationStateForPage(RegisterJourneyPage.EmailConfirmation);
 }