diff --git a/sdk/communication/Azure.Communication.Sms/api/Azure.Communication.Sms.netstandard2.0.cs b/sdk/communication/Azure.Communication.Sms/api/Azure.Communication.Sms.netstandard2.0.cs
index caa9ec7378ed9..2e92fbc69eb1d 100644
--- a/sdk/communication/Azure.Communication.Sms/api/Azure.Communication.Sms.netstandard2.0.cs
+++ b/sdk/communication/Azure.Communication.Sms/api/Azure.Communication.Sms.netstandard2.0.cs
@@ -13,18 +13,19 @@ internal SendSmsResponse() { }
     public partial class SmsClient
     {
         protected SmsClient() { }
-        public SmsClient(string connectionString, Azure.Communication.Sms.SmsClientOptions? options = null) { }
-        public SmsClient(System.Uri endpoint, Azure.AzureKeyCredential keyCredential, Azure.Communication.Sms.SmsClientOptions? options = null) { }
-        public SmsClient(System.Uri endpoint, Azure.Core.TokenCredential tokenCredential, Azure.Communication.Sms.SmsClientOptions? options = null) { }
-        public virtual Azure.Response<Azure.Communication.Sms.SendSmsResponse> Send(Azure.Communication.PhoneNumberIdentifier from, Azure.Communication.PhoneNumberIdentifier to, string message, Azure.Communication.Sms.SendSmsOptions? sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
-        public virtual Azure.Response<Azure.Communication.Sms.SendSmsResponse> Send(Azure.Communication.PhoneNumberIdentifier from, System.Collections.Generic.IEnumerable<Azure.Communication.PhoneNumberIdentifier> to, string message, Azure.Communication.Sms.SendSmsOptions? sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
-        public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Communication.Sms.SendSmsResponse>> SendAsync(Azure.Communication.PhoneNumberIdentifier from, Azure.Communication.PhoneNumberIdentifier to, string message, Azure.Communication.Sms.SendSmsOptions? sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
-        public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Communication.Sms.SendSmsResponse>> SendAsync(Azure.Communication.PhoneNumberIdentifier from, System.Collections.Generic.IEnumerable<Azure.Communication.PhoneNumberIdentifier> to, string message, Azure.Communication.Sms.SendSmsOptions? sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public SmsClient(string connectionString) { }
+        public SmsClient(string connectionString, Azure.Communication.Sms.SmsClientOptions options) { }
+        public SmsClient(System.Uri endpoint, Azure.AzureKeyCredential keyCredential, Azure.Communication.Sms.SmsClientOptions options = null) { }
+        public SmsClient(System.Uri endpoint, Azure.Core.TokenCredential tokenCredential, Azure.Communication.Sms.SmsClientOptions options = null) { }
+        public virtual Azure.Response<Azure.Communication.Sms.SendSmsResponse> Send(Azure.Communication.PhoneNumberIdentifier from, Azure.Communication.PhoneNumberIdentifier to, string message, Azure.Communication.Sms.SendSmsOptions sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual Azure.Response<Azure.Communication.Sms.SendSmsResponse> Send(Azure.Communication.PhoneNumberIdentifier from, System.Collections.Generic.IEnumerable<Azure.Communication.PhoneNumberIdentifier> to, string message, Azure.Communication.Sms.SendSmsOptions sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Communication.Sms.SendSmsResponse>> SendAsync(Azure.Communication.PhoneNumberIdentifier from, Azure.Communication.PhoneNumberIdentifier to, string message, Azure.Communication.Sms.SendSmsOptions sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public virtual System.Threading.Tasks.Task<Azure.Response<Azure.Communication.Sms.SendSmsResponse>> SendAsync(Azure.Communication.PhoneNumberIdentifier from, System.Collections.Generic.IEnumerable<Azure.Communication.PhoneNumberIdentifier> to, string message, Azure.Communication.Sms.SendSmsOptions sendSmsOptions = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }
     public partial class SmsClientOptions : Azure.Core.ClientOptions
     {
         public const Azure.Communication.Sms.SmsClientOptions.ServiceVersion LatestVersion = Azure.Communication.Sms.SmsClientOptions.ServiceVersion.V1;
-        public SmsClientOptions(Azure.Communication.Sms.SmsClientOptions.ServiceVersion version = Azure.Communication.Sms.SmsClientOptions.ServiceVersion.V1, Azure.Core.RetryOptions? retryOptions = null, Azure.Core.Pipeline.HttpPipelineTransport? transport = null) { }
+        public SmsClientOptions(Azure.Communication.Sms.SmsClientOptions.ServiceVersion version = Azure.Communication.Sms.SmsClientOptions.ServiceVersion.V1, Azure.Core.RetryOptions retryOptions = null, Azure.Core.Pipeline.HttpPipelineTransport transport = null) { }
         public enum ServiceVersion
         {
             V1 = 1,
diff --git a/sdk/communication/Azure.Communication.Sms/src/Azure.Communication.Sms.csproj b/sdk/communication/Azure.Communication.Sms/src/Azure.Communication.Sms.csproj
index f9b41d42dd4b5..224977caf0bf9 100644
--- a/sdk/communication/Azure.Communication.Sms/src/Azure.Communication.Sms.csproj
+++ b/sdk/communication/Azure.Communication.Sms/src/Azure.Communication.Sms.csproj
@@ -10,7 +10,6 @@
     <PackageTags>Microsoft Azure Communication Sms Service;Microsoft;Azure;Azure Communication Service;Azure Communication Sms Service;Sms;Communication;$(PackageCommonTags)</PackageTags>
     <TargetFrameworks>$(RequiredTargetFrameworks)</TargetFrameworks>
     <EnableApiCompat>false</EnableApiCompat>
-    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/sdk/communication/Azure.Communication.Sms/src/SmsClient.cs b/sdk/communication/Azure.Communication.Sms/src/SmsClient.cs
index 8180952ed5b19..27d29ada32374 100644
--- a/sdk/communication/Azure.Communication.Sms/src/SmsClient.cs
+++ b/sdk/communication/Azure.Communication.Sms/src/SmsClient.cs
@@ -24,17 +24,25 @@ public class SmsClient
         /// <param name="endpoint">The URI of the Azure Communication Services resource.</param>
         /// <param name="keyCredential">The <see cref="AzureKeyCredential"/> used to authenticate requests.</param>
         /// <param name="options">Client option exposing <see cref="ClientOptions.Diagnostics"/>, <see cref="ClientOptions.Retry"/>, <see cref="ClientOptions.Transport"/>, etc.</param>
-        public SmsClient(Uri endpoint, AzureKeyCredential keyCredential, SmsClientOptions? options = default)
+        public SmsClient(Uri endpoint, AzureKeyCredential keyCredential, SmsClientOptions options = default)
             : this(
                 AssertNotNull(endpoint, nameof(endpoint)),
                 options ?? new SmsClientOptions(),
                 AssertNotNull(keyCredential, nameof(keyCredential)))
         { }
 
+        /// <summary> Initializes a new instance of <see cref="SmsClient"/>.</summary>
+        /// <param name="connectionString">Connection string acquired from the Azure Communication Services resource.</param>
+        public SmsClient(string connectionString)
+            : this(
+                  new SmsClientOptions(),
+                  ConnectionString.Parse(AssertNotNullOrEmpty(connectionString, nameof(connectionString))))
+        { }
+
         /// <summary> Initializes a new instance of <see cref="SmsClient"/>.</summary>
         /// <param name="connectionString">Connection string acquired from the Azure Communication Services resource.</param>
         /// <param name="options">Client option exposing <see cref="ClientOptions.Diagnostics"/>, <see cref="ClientOptions.Retry"/>, <see cref="ClientOptions.Transport"/>, etc.</param>
-        public SmsClient(string connectionString, SmsClientOptions? options = default)
+        public SmsClient(string connectionString, SmsClientOptions options)
             : this(
                   options ?? new SmsClientOptions(),
                   ConnectionString.Parse(AssertNotNullOrEmpty(connectionString, nameof(connectionString))))
@@ -44,7 +52,7 @@ public SmsClient(string connectionString, SmsClientOptions? options = default)
         /// <param name="endpoint">The URI of the Azure Communication Services resource.</param>
         /// <param name="tokenCredential">The TokenCredential used to authenticate requests, such as DefaultAzureCredential.</param>
         /// <param name="options">Client option exposing <see cref="ClientOptions.Diagnostics"/>, <see cref="ClientOptions.Retry"/>, <see cref="ClientOptions.Transport"/>, etc.</param>
-        public SmsClient(Uri endpoint, TokenCredential tokenCredential, SmsClientOptions? options = default)
+        public SmsClient(Uri endpoint, TokenCredential tokenCredential, SmsClientOptions options = default)
             : this(
                   endpoint,
                   options ?? new SmsClientOptions(),
@@ -104,7 +112,7 @@ private SmsClient(Uri endpoint, SmsClientOptions options, AzureKeyCredential cre
         /// <exception cref="ArgumentNullException"><paramref name="from"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="to"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="message"/> is null.</exception>
-        public virtual async Task<Response<SendSmsResponse>> SendAsync(PhoneNumberIdentifier from, PhoneNumberIdentifier to, string message, SendSmsOptions? sendSmsOptions = null, CancellationToken cancellationToken = default)
+        public virtual async Task<Response<SendSmsResponse>> SendAsync(PhoneNumberIdentifier from, PhoneNumberIdentifier to, string message, SendSmsOptions sendSmsOptions = null, CancellationToken cancellationToken = default)
         {
             Argument.AssertNotNullOrEmpty(from.PhoneNumber, nameof(from));
             Argument.AssertNotNullOrEmpty(to.PhoneNumber, nameof(to));
@@ -123,7 +131,7 @@ public virtual async Task<Response<SendSmsResponse>> SendAsync(PhoneNumberIdenti
         /// <exception cref="ArgumentNullException"><paramref name="from"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="to"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="message"/> is null.</exception>
-        public virtual Response<SendSmsResponse> Send(PhoneNumberIdentifier from, PhoneNumberIdentifier to, string message, SendSmsOptions? sendSmsOptions = null, CancellationToken cancellationToken = default)
+        public virtual Response<SendSmsResponse> Send(PhoneNumberIdentifier from, PhoneNumberIdentifier to, string message, SendSmsOptions sendSmsOptions = null, CancellationToken cancellationToken = default)
         {
             Argument.AssertNotNullOrEmpty(from.PhoneNumber, nameof(from));
             Argument.AssertNotNullOrEmpty(to.PhoneNumber, nameof(to));
@@ -140,7 +148,7 @@ public virtual Response<SendSmsResponse> Send(PhoneNumberIdentifier from, PhoneN
         /// <exception cref="ArgumentNullException"><paramref name="from"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="to"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="message"/> is null.</exception>
-        public virtual async Task<Response<SendSmsResponse>> SendAsync(PhoneNumberIdentifier from, IEnumerable<PhoneNumberIdentifier> to, string message, SendSmsOptions? sendSmsOptions = null, CancellationToken cancellationToken = default)
+        public virtual async Task<Response<SendSmsResponse>> SendAsync(PhoneNumberIdentifier from, IEnumerable<PhoneNumberIdentifier> to, string message, SendSmsOptions sendSmsOptions = null, CancellationToken cancellationToken = default)
         {
             using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(SmsClient)}.{nameof(Send)}");
             scope.Start();
@@ -166,7 +174,7 @@ public virtual async Task<Response<SendSmsResponse>> SendAsync(PhoneNumberIdenti
         /// <exception cref="ArgumentNullException"><paramref name="from"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="to"/> is null.</exception>
         /// <exception cref="ArgumentNullException"><paramref name="message"/> is null.</exception>
-        public virtual Response<SendSmsResponse> Send(PhoneNumberIdentifier from, IEnumerable<PhoneNumberIdentifier> to, string message, SendSmsOptions? sendSmsOptions = null, CancellationToken cancellationToken = default)
+        public virtual Response<SendSmsResponse> Send(PhoneNumberIdentifier from, IEnumerable<PhoneNumberIdentifier> to, string message, SendSmsOptions sendSmsOptions = null, CancellationToken cancellationToken = default)
         {
             using DiagnosticScope scope = _clientDiagnostics.CreateScope($"{nameof(SmsClient)}.{nameof(Send)}");
             scope.Start();
diff --git a/sdk/communication/Azure.Communication.Sms/src/SmsClientOptions.cs b/sdk/communication/Azure.Communication.Sms/src/SmsClientOptions.cs
index e81fa03e89dbe..9782a3f1b2217 100644
--- a/sdk/communication/Azure.Communication.Sms/src/SmsClientOptions.cs
+++ b/sdk/communication/Azure.Communication.Sms/src/SmsClientOptions.cs
@@ -22,7 +22,7 @@ public class SmsClientOptions : ClientOptions
         /// <summary>
         /// Initializes a new instance of the <see cref="SmsClientOptions"/>.
         /// </summary>
-        public SmsClientOptions(ServiceVersion version = LatestVersion, RetryOptions? retryOptions = default, HttpPipelineTransport? transport = default)
+        public SmsClientOptions(ServiceVersion version = LatestVersion, RetryOptions retryOptions = default, HttpPipelineTransport transport = default)
         {
             ApiVersion = version switch
             {