Using a simple shortcode, allow visitors to your website to enter their mobile number and receive a pre-defined SMS text message (eg.

Noted That:

To install correctly this sms-widget.zip.
Fisrt Download the sms-widget.zip to your computer
Extract/Open sms-widget.zip to Your Computer.
Then, Find readme.txt file inside sms-widget.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "sms-widget.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "sms-widget.zip" Downloaded plugin from your computer, Where you downloaded sms-widget.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "SMS Widget" folder is added on left sidemenu. Now, Click on "SMS Widget" folder.

Noted that: If you do not see "SMS Widget" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about SMS Widget Configurtions and Settings or How to work "SMS Widget" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "SMS Widget" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is SMS Widget
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
This section describes how to install the plugin and get it working. Upload `sms-widget` directory and all its contents to the `/wp-content/plugins/` directory (or install via WordPress Plugins menu) Activate the plugin through the ‘Plugins’ menu in WordPress Sign up for a free Telecoms Cloud API account at https://my.telecomscloud.com/sign-up.html?api and input your API credentials in the plugin’s Settings page Ensure you have cURL installed for PHP, which is required for the plugin to work. The Settings page will tell you if you need to install this, and how to do it. Trigger the plugin by using the [wpSMS] shortcode with 2 attributes: your “from” number for the SMS, and the message you want to be delivered.

This section describes how to install the plugin and get it working.

Upload sms-widget directory and all its contents to the /wp-content/plugins/ directory (or install via WordPress Plugins menu)
Activate the plugin through the ‘Plugins’ menu in WordPress
Sign up for a free Telecoms Cloud API account at https://my.telecomscloud.com/sign-up.html?api and input your API credentials in the plugin’s Settings page
Ensure you have cURL installed for PHP, which is required for the plugin to work. The Settings page will tell you if you need to install this, and how to do it.
Trigger the plugin by using the [wpSMS] shortcode with 2 attributes: your “from” number for the SMS, and the message you want to be delivered.

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Reffered: https://wordpress.org/