Sample How to Send SMS in Android using Unity3D and SMS Manager. (without opening SMS Composer)

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Directory : [Project]/Assets/Plugins/Android/AndroidManifest.xml -->
<!-- Configure according to your android application information. -->
<manifest
    xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.unity3d.player"
	android:installLocation="preferExternal"
    android:versionCode="1"
    android:versionName="1.0">
  <supports-screens
      android:smallScreens="true"
      android:normalScreens="true"
      android:largeScreens="true"
      android:xlargeScreens="true"
      android:anyDensity="true"/>
  
  <!-- REQUIRED permission -->
  <uses-permission android:name="android.permission.SEND_SMS" />
  <!-- Additional -->
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  <uses-permission android:name="android.permission.STORAGE" />
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
  <uses-permission android:name="android.permission.SMS_RECEIVED" />
  <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

  <application
  android:theme="@style/UnityThemeSelector"
  android:icon="@drawable/app_icon"
      android:label="@string/app_name"
      android:debuggable="true">
    <activity android:name="com.unity3d.player.UnityPlayerActivity"
              android:label="@string/app_name">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
      <meta-data android:name="unityplayer.UnityActivity" android:value="true" />
    </activity>
  </application>
</manifest>

SendSMS.cs

using UnityEngine;

public class SendSMS : MonoBehaviour
{
    AndroidJavaObject currentActivity;

    public void Send(string phone)
    {
        if (Application.platform == RuntimePlatform.Android)
        {
            RunAndroidUiThread();
        }
    }

    void RunAndroidUiThread()
    {
        AndroidJavaClass UnityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
        currentActivity = UnityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
        currentActivity.Call("runOnUiThread", new AndroidJavaRunnable(SendProcess));
    }

    void SendProcess()
    {
        Debug.Log("Running on UI thread");
        AndroidJavaObject context = currentActivity.Call<AndroidJavaObject>("getApplicationContext");
        
        // SMS Information
        
        string phone = "08888888888";
        string text = "Hello World. This SMS is sent using Android SMS Manager.";
        string alert;

        try
        {
            // SMS Manager

            AndroidJavaClass SMSManagerClass = new AndroidJavaClass("android.telephony.SmsManager");
            AndroidJavaObject SMSManagerObject = SMSManagerClass.CallStatic<AndroidJavaObject>("getDefault");
            SMSManagerObject.Call("sendTextMessage", phone, null, text, null, null);

            alert = "Message sent successfully.";
        }
        catch (System.Exception e)
        {
            Debug.Log("Error : " + e.StackTrace.ToString());

            alert = "Error has been Occurred. Fail to send message.";
        }

        // Show Toast

        AndroidJavaClass Toast = new AndroidJavaClass("android.widget.Toast");
        AndroidJavaObject javaString = new AndroidJavaObject("java.lang.String", alert);
        AndroidJavaObject toast = Toast.CallStatic<AndroidJavaObject>("makeText", context, javaString, Toast.GetStatic<int>("LENGTH_SHORT"));
        toast.Call("show");
    }
}

hola
necesito ayuda con este código, ya que lo ocupo para un proyecto

Hey im trying to implement this code but it wont work, could it be that this is impossible in newer android versions?

@Cunibon I'm sorry to say that I don't know, android often updating their spec and API on the newer version, especially permission issue.. I haven't touched Unity and Android in the last couple of years, I'll check and let let you know if I have the time

@rmdwirizki that would be great. I've been trying to get an answer on reddit or stackoverflow for months now didnt expect to actually get an answer here 👍

Don't forget to go to your app in android and give permission to the app to send SMS. It will solve a lot of issues.