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@@ -1,3 +1,121 @@
-# Emailing
+# SMS Sending
 
-TODO!
\ No newline at end of file
+The ABP Framework provides an abstraction to sending SMS. Having such an abstraction has some benefits;
+
+- You can **easily integrate** to your favorite SMS sender with a few lines of configuration.
+- You can then **easily change** your SMS sender without changing your application code.
+- If you want to create **reusable application modules**, you don't need to make assumption about how the SMS are sent.
+
+## Installation
+
+It is suggested to use the [ABP CLI](CLI.md) to install this package.
+
+### Using the ABP CLI
+
+Open a command line window in the folder of the project (.csproj file) and type the following command:
+
+```bash
+abp add-package Volo.Abp.Sms
+```
+
+### Manual Installation
+
+If you want to manually install;
+
+1. Add the [Volo.Abp.Sms](https://www.nuget.org/packages/Volo.Abp.Sms) NuGet package to your project:
+
+```
+Install-Package Volo.Abp.Sms
+```
+
+2. Add the `AbpSmsModule` to the dependency list of your module:
+
+```csharp
+[DependsOn(
+    //...other dependencies
+    typeof(AbpSmsModule) //Add the new module dependency
+    )]
+public class YourModule : AbpModule
+{
+}
+```
+
+## Sending SMS
+
+[Inject](Dependency-Injection.md) the `ISmsSender` into any service and use the `SendAsync` method to send a SMS.
+
+**Example**
+
+```csharp
+using System.Threading.Tasks;
+using Volo.Abp.DependencyInjection;
+using Volo.Abp.Sms;
+
+namespace MyProject
+{
+    public class MyService : ITransientDependency
+    {
+        private readonly ISmsSender _smsSender;
+
+        public MyService(ISmsSender smsSender)
+        {
+            _smsSender = smsSender;
+        }
+
+        public async Task DoItAsync()
+        {
+            await _smsSender.SendAsync(
+                "+012345678901",        // target phone number
+                "This is test sms..."   // SMS text
+            );
+        }
+    }
+}
+```
+
+The given `SendAsync` method in the example is an extension method to send sms with primitive paremeters, it basicly creates `SmsMessage` object and pass it. You can also use the default `SendAsync` method which requires `SmsMessage` object.
+
+> `ISmsSender` is the suggested way to send SMS, since it makes your code provider independent.
+
+## SmsMessage
+
+In addition to use primitive parameters, you can pass a `SmsMessage` object to the `SendAsync` method.
+
+- `PhoneNumber` (string): Target phone number to send sms.
+- `Text` (string): SMS Text
+- `Properties` (Dictionary<string, string>): string key-value pair to handle different usages by senders.
+
+## NullSmsSender
+
+`NullSmsSender` is a built-in class that implements the `ISmsSender`, but writes sms contents to the [standard log system](Logging.md), rathen than actually sending the SMSs.
+
+This class can be useful especially in development time where you generally don't want to send real sms.
+`NullSmsSender` will try to register itself automatically if there is no other registrated sms sender.
+
+## Creating a custom SMS sender
+
+You can easily create your custom provider by creating a class that implements the `ISmsSender` interface.
+
+```csharp
+using System.IO;
+using System.Threading.Tasks;
+using Volo.Abp.Sms;
+using Volo.Abp.DependencyInjection;
+
+namespace AbpDemo
+{
+    public class MyCustomSmsSender : ISmsSender, ITransientDependency
+    {
+        public async Task SendAsync(SmsMessage smsMessage)
+        {
+            // Send sms
+        }
+    }
+}
+```
+
+That's all. Now you can send SMS by using `MyCustomSmsSender` in your application.
+
+## See also
+
+- [Twilio SMS Sender](https://docs.abp.io/en/commercial/latest/modules/twilio-sms) with [ABP Commercial](https://commercial.abp.io/).