diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Directory.Packages.props b/src/Templates/Boilerplate/Bit.Boilerplate/src/Directory.Packages.props
index 89faa3f3c7..30ebb40fdd 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Directory.Packages.props
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Directory.Packages.props
@@ -9,6 +9,7 @@
     <PackageVersion Include="Bit.Bswup" Version="8.12.0-pre-03" />
     <PackageVersion Include="Bit.CodeAnalyzers" Version="8.12.0-pre-03" />
     <PackageVersion Include="Bit.SourceGenerators" Version="8.12.0-pre-03" />
+    <PackageVersion Include="libphonenumber-csharp" Version="8.13.47" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.Authorization" Version="8.0.10" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.10" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.Web" Version="8.0.10" />
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Boilerplate.Server.Api.csproj b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Boilerplate.Server.Api.csproj
index 2762b17f1c..ce557d156f 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Boilerplate.Server.Api.csproj
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Boilerplate.Server.Api.csproj
@@ -15,6 +15,7 @@
     </ItemGroup>
 
     <ItemGroup>
+        <PackageReference Include="libphonenumber-csharp" />
         <PackageReference Condition=" '$(appInsights)' == 'true' OR '$(appInsights)' == '' " Include="Microsoft.ApplicationInsights.AspNetCore" />
         <PackageReference Include="Humanizer" />
         <PackageReference Include="QRCoder" />
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.PhoneConfirmation.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.PhoneConfirmation.cs
index a888a3af38..eb8bdcff8a 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.PhoneConfirmation.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.PhoneConfirmation.cs
@@ -8,11 +8,12 @@ namespace Boilerplate.Server.Api.Controllers.Identity;
 
 public partial class IdentityController
 {
-    [AutoInject] private SmsService smsService = default!;
+    [AutoInject] private PhoneService phoneService = default!;
 
     [HttpPost]
     public async Task SendConfirmPhoneToken(SendPhoneTokenRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindByPhoneNumber(request.PhoneNumber!)
             ?? throw new BadRequestException(Localizer[nameof(AppStrings.UserNotFound)]);
 
@@ -25,6 +26,7 @@ public async Task SendConfirmPhoneToken(SendPhoneTokenRequestDto request, Cancel
     [HttpPost, Produces<TokenResponseDto>()]
     public async Task ConfirmPhone(ConfirmPhoneRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindByPhoneNumber(request.PhoneNumber!)
             ?? throw new BadRequestException(Localizer[nameof(AppStrings.UserNotFound)]);
 
@@ -77,6 +79,6 @@ private async Task SendConfirmPhoneToken(User user, CancellationToken cancellati
         var token = await userManager.GenerateUserTokenAsync(user, TokenOptions.DefaultPhoneProvider, FormattableString.Invariant($"VerifyPhoneNumber:{phoneNumber},{user.PhoneNumberTokenRequestedOn?.ToUniversalTime()}"));
         var link = new Uri(HttpContext.Request.GetWebClientUrl(), $"{Urls.ConfirmPage}?phoneNumber={Uri.EscapeDataString(phoneNumber!)}&phoneToken={Uri.EscapeDataString(token)}&culture={CultureInfo.CurrentUICulture.Name}");
 
-        await smsService.SendSms(Localizer[nameof(AppStrings.ConfirmPhoneTokenSmsText), token], phoneNumber, cancellationToken);
+        await phoneService.SendSms(Localizer[nameof(AppStrings.ConfirmPhoneTokenSmsText), token], phoneNumber, cancellationToken);
     }
 }
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.ResetPassword.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.ResetPassword.cs
index 0224a83a05..24846da43f 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.ResetPassword.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.ResetPassword.cs
@@ -13,6 +13,7 @@ public partial class IdentityController
     [HttpPost]
     public async Task SendResetPasswordToken(SendResetPasswordTokenRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindUserAsync(request)
                     ?? throw new ResourceNotFoundException(Localizer[nameof(AppStrings.UserNotFound)]);
 
@@ -48,7 +49,7 @@ public async Task SendResetPasswordToken(SendResetPasswordTokenRequestDto reques
 
         if (await userManager.IsPhoneNumberConfirmedAsync(user))
         {
-            sendMessagesTasks.Add(smsService.SendSms(message, user.PhoneNumber!, cancellationToken));
+            sendMessagesTasks.Add(phoneService.SendSms(message, user.PhoneNumber!, cancellationToken));
         }
 
         //#if (signalr == true)
@@ -65,6 +66,7 @@ public async Task SendResetPasswordToken(SendResetPasswordTokenRequestDto reques
     [HttpPost]
     public async Task ResetPassword(ResetPasswordRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindUserAsync(request) ?? throw new ResourceNotFoundException(Localizer[nameof(AppStrings.UserNotFound)]);
 
         var expired = (DateTimeOffset.Now - user.ResetPasswordTokenRequestedOn) > AppSettings.Identity.ResetPasswordTokenLifetime;
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.SocialSignIn.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.SocialSignIn.cs
index 5d570e3e7b..abbaa6f0a4 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.SocialSignIn.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.SocialSignIn.cs
@@ -34,7 +34,7 @@ public async Task<ActionResult> SocialSignInCallback(string? returnUrl = null, i
         try
         {
             var email = info.Principal.GetEmail();
-            var phoneNumber = info.Principal.Claims.FirstOrDefault(c => c.Type is ClaimTypes.HomePhone or ClaimTypes.MobilePhone or ClaimTypes.OtherPhone)?.Value;
+            var phoneNumber = phoneService.NormalizePhoneNumber(info.Principal.Claims.FirstOrDefault(c => c.Type is ClaimTypes.HomePhone or ClaimTypes.MobilePhone or ClaimTypes.OtherPhone)?.Value);
 
             var user = await userManager.FindByLoginAsync(info.LoginProvider, info.ProviderKey);
 
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.cs
index 190e8faf9f..5c86ee8042 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/IdentityController.cs
@@ -9,6 +9,7 @@
 using Boilerplate.Shared.Dtos.Identity;
 using Boilerplate.Server.Api.Models.Identity;
 using Boilerplate.Shared.Controllers.Identity;
+using Boilerplate.Server.Api.Services.Identity;
 
 namespace Boilerplate.Server.Api.Controllers.Identity;
 
@@ -43,6 +44,7 @@ public partial class IdentityController : AppControllerBase, IIdentityController
     [HttpPost]
     public async Task SignUp(SignUpRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         //#if (captcha == "reCaptcha")
         if (await googleRecaptchaHttpClient.Verify(request.GoogleRecaptchaResponse, cancellationToken) is false)
             throw new BadRequestException(Localizer[nameof(AppStrings.InvalidGoogleRecaptchaResponse)]);
@@ -88,6 +90,7 @@ public async Task SignUp(SignUpRequestDto request, CancellationToken cancellatio
     [HttpPost, Produces<SignInResponseDto>()]
     public async Task SignIn(SignInRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         signInManager.AuthenticationScheme = IdentityConstants.BearerScheme;
 
         var user = await userManager.FindUserAsync(request) ?? throw new UnauthorizedException(Localizer[nameof(AppStrings.InvalidUserCredentials)]);
@@ -239,6 +242,7 @@ await signInManager.ValidateSecurityStampAsync(refreshTicket.Principal) is not U
     [HttpPost]
     public async Task SendOtp(IdentityRequestDto request, string? returnUrl = null, CancellationToken cancellationToken = default)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindUserAsync(request)
                     ?? throw new ResourceNotFoundException(Localizer[nameof(AppStrings.UserNotFound)]);
 
@@ -264,7 +268,7 @@ public async Task SendOtp(IdentityRequestDto request, string? returnUrl = null,
         if (await userManager.IsPhoneNumberConfirmedAsync(user))
         {
             var smsMessage = Localizer[nameof(AppStrings.OtpShortText), await userManager.GenerateUserTokenAsync(user, TokenOptions.DefaultPhoneProvider, FormattableString.Invariant($"Otp_Sms,{user.OtpRequestedOn?.ToUniversalTime()}"))].ToString();
-            sendMessagesTasks.Add(smsService.SendSms(smsMessage, user.PhoneNumber!, cancellationToken));
+            sendMessagesTasks.Add(phoneService.SendSms(smsMessage, user.PhoneNumber!, cancellationToken));
         }
 
         //#if (signalr == true)
@@ -283,6 +287,7 @@ public async Task SendOtp(IdentityRequestDto request, string? returnUrl = null,
     [HttpPost]
     public async Task SendTwoFactorToken(SignInRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindUserAsync(request) ?? throw new ResourceNotFoundException(Localizer[nameof(AppStrings.UserNotFound)]);
 
         if (user.TwoFactorEnabled is false)
@@ -320,7 +325,7 @@ public async Task SendTwoFactorToken(SignInRequestDto request, CancellationToken
 
         if (firstStepAuthenticationMethod != "Sms" && await userManager.IsPhoneNumberConfirmedAsync(user))
         {
-            sendMessagesTasks.Add(smsService.SendSms(message, user.PhoneNumber!, cancellationToken));
+            sendMessagesTasks.Add(phoneService.SendSms(message, user.PhoneNumber!, cancellationToken));
         }
 
         //#if (signalr == true)
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/UserController.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/UserController.cs
index 9a4318feac..986753a196 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/UserController.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Controllers/Identity/UserController.cs
@@ -1,7 +1,7 @@
 using System.Text;
 using System.Text.Encodings.Web;
-using Humanizer;
 using QRCoder;
+using Humanizer;
 using Boilerplate.Server.Api.Services;
 using Boilerplate.Shared.Dtos.Identity;
 using Boilerplate.Server.Api.Models.Identity;
@@ -18,7 +18,7 @@ public partial class UserController : AppControllerBase, IUserController
 
     [AutoInject] private IUserEmailStore<User> userEmailStore = default!;
 
-    [AutoInject] private SmsService smsService = default!;
+    [AutoInject] private PhoneService phoneService = default!;
 
     [AutoInject] private EmailService emailService = default!;
 
@@ -218,6 +218,7 @@ public async Task ChangeEmail(ChangeEmailRequestDto request, CancellationToken c
     [HttpPost]
     public async Task SendChangePhoneNumberToken(SendPhoneTokenRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindByIdAsync(User.GetUserId().ToString());
 
         var resendDelay = (DateTimeOffset.Now - user!.PhoneNumberTokenRequestedOn) - AppSettings.Identity.PhoneNumberTokenLifetime;
@@ -233,12 +234,13 @@ public async Task SendChangePhoneNumberToken(SendPhoneTokenRequestDto request, C
 
         var token = await userManager.GenerateChangePhoneNumberTokenAsync(user!, request.PhoneNumber!);
 
-        await smsService.SendSms(Localizer[nameof(AppStrings.ChangePhoneNumberTokenSmsText), token], request.PhoneNumber!, cancellationToken);
+        await phoneService.SendSms(Localizer[nameof(AppStrings.ChangePhoneNumberTokenSmsText), token], request.PhoneNumber!, cancellationToken);
     }
 
     [HttpPost]
     public async Task ChangePhoneNumber(ChangePhoneNumberRequestDto request, CancellationToken cancellationToken)
     {
+        request.PhoneNumber = phoneService.NormalizePhoneNumber(request.PhoneNumber);
         var user = await userManager.FindByIdAsync(User.GetUserId().ToString());
 
         var expired = (DateTimeOffset.Now - user!.PhoneNumberTokenRequestedOn) > AppSettings.Identity.PhoneNumberTokenLifetime;
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Program.Services.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Program.Services.cs
index 29376e3c18..e33ac8a191 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Program.Services.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Program.Services.cs
@@ -11,6 +11,7 @@
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.ResponseCompression;
 using Twilio;
+using PhoneNumbers;
 using FluentStorage;
 using FluentStorage.Blobs;
 //#if (notification == true)
@@ -19,6 +20,7 @@
 using Boilerplate.Server.Api.Services;
 using Boilerplate.Server.Api.Controllers;
 using Boilerplate.Server.Api.Models.Identity;
+using Boilerplate.Server.Api.Services.Identity;
 
 namespace Boilerplate.Server.Api;
 
@@ -195,7 +197,7 @@ void AddDbContext(DbContextOptionsBuilder options)
         }
 
         services.AddTransient<EmailService>();
-        services.AddTransient<SmsService>();
+        services.AddTransient<PhoneService>();
         if (appSettings.Sms.Configured)
         {
             TwilioClient.Init(appSettings.Sms.TwilioAccountSid, appSettings.Sms.TwilioAutoToken);
@@ -230,6 +232,8 @@ void AddDbContext(DbContextOptionsBuilder options)
         services.AddAdsPush(configuration);
         services.AddTransient<PushNotificationService>();
         //#endif
+
+        services.AddSingleton(_ => PhoneNumberUtil.GetInstance());
     }
 
     private static void AddIdentity(WebApplicationBuilder builder)
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppIdentityErrorDescriber.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppIdentityErrorDescriber.cs
similarity index 98%
rename from src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppIdentityErrorDescriber.cs
rename to src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppIdentityErrorDescriber.cs
index 9792e886e1..653f1e4f7b 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppIdentityErrorDescriber.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppIdentityErrorDescriber.cs
@@ -1,6 +1,6 @@
 using System.Data;
 
-namespace Boilerplate.Server.Api.Services;
+namespace Boilerplate.Server.Api.Services.Identity;
 
 public partial class AppIdentityErrorDescriber : IdentityErrorDescriber
 {
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppSecureJwtDataFormat.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppSecureJwtDataFormat.cs
similarity index 97%
rename from src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppSecureJwtDataFormat.cs
rename to src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppSecureJwtDataFormat.cs
index 56fe5ecdd7..77f23f832e 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppSecureJwtDataFormat.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppSecureJwtDataFormat.cs
@@ -2,7 +2,7 @@
 using Microsoft.IdentityModel.Tokens;
 using Microsoft.AspNetCore.Authentication;
 
-namespace Boilerplate.Server.Api.Services;
+namespace Boilerplate.Server.Api.Services.Identity;
 
 /// <summary>
 /// Stores bearer token in jwt format
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppUserClaimsPrincipalFactory.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppUserClaimsPrincipalFactory.cs
similarity index 93%
rename from src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppUserClaimsPrincipalFactory.cs
rename to src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppUserClaimsPrincipalFactory.cs
index fb8ddb7f98..1b9a6f5146 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppUserClaimsPrincipalFactory.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppUserClaimsPrincipalFactory.cs
@@ -1,6 +1,6 @@
 using Boilerplate.Server.Api.Models.Identity;
 
-namespace Boilerplate.Server.Api.Services;
+namespace Boilerplate.Server.Api.Services.Identity;
 
 public partial class AppUserClaimsPrincipalFactory(UserManager<User> userManager, IOptions<IdentityOptions> optionsAccessor)
     : UserClaimsPrincipalFactory<User>(userManager, optionsAccessor)
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppUserConfirmation.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppUserConfirmation.cs
similarity index 84%
rename from src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppUserConfirmation.cs
rename to src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppUserConfirmation.cs
index 14a4f64f87..7113b30613 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/AppUserConfirmation.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/Identity/AppUserConfirmation.cs
@@ -1,6 +1,6 @@
 using Boilerplate.Server.Api.Models.Identity;
 
-namespace Boilerplate.Server.Api.Services;
+namespace Boilerplate.Server.Api.Services.Identity;
 
 public partial class AppUserConfirmation : IUserConfirmation<User>
 {
diff --git a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/SmsService.cs b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/PhoneService.cs
similarity index 51%
rename from src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/SmsService.cs
rename to src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/PhoneService.cs
index f992c9896c..52fe8e48c7 100644
--- a/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/SmsService.cs
+++ b/src/Templates/Boilerplate/Bit.Boilerplate/src/Server/Boilerplate.Server.Api/Services/PhoneService.cs
@@ -1,12 +1,33 @@
-using Twilio.Rest.Api.V2010.Account;
+using PhoneNumbers;
+using Twilio.Rest.Api.V2010.Account;
 
 namespace Boilerplate.Server.Api.Services;
 
-public partial class SmsService
+public partial class PhoneService
 {
     [AutoInject] private readonly AppSettings appSettings = default!;
-    [AutoInject] private readonly ILogger<SmsService> logger = default!;
+    [AutoInject] private readonly ILogger<PhoneService> logger = default!;
     [AutoInject] private readonly IHostEnvironment hostEnvironment = default!;
+    [AutoInject] private readonly IHttpContextAccessor httpContextAccessor = default!;
+    [AutoInject] private readonly PhoneNumberUtil phoneNumberUtil = default!;
+    private const string APP_DEFAULT_REGION = "US" /*Two letter ISO region name*/;
+
+    public string? NormalizePhoneNumber(string? phoneNumber)
+    {
+        if (string.IsNullOrEmpty(phoneNumber))
+            return null;
+
+        // Get region from Cloudflare "CF-IPCountry" header if available, otherwise use UI culture's region if multilingual is enabled, or fallback to the default region.
+        var region = httpContextAccessor.HttpContext!.Request.Headers.TryGetValue("CF-IPCountry", out var value)
+                         ? value.ToString()
+                         : CultureInfoManager.MultilingualEnabled
+                             ? new RegionInfo(CultureInfo.CurrentUICulture.Name).TwoLetterISORegionName
+        : APP_DEFAULT_REGION;
+
+        var parsedPhoneNumber = phoneNumberUtil.Parse(phoneNumber, region);
+
+        return phoneNumberUtil.Format(parsedPhoneNumber, PhoneNumberFormat.E164);
+    }
 
     public async Task SendSms(string messageText, string phoneNumber, CancellationToken cancellationToken)
     {