PositiveSMS, is an offline desktop tool with which users could send text messages from a pc or desktop to mobile phones - it is also know as pc to mobile messaging. Phone numbers are stored in a phone book. No installation is required as this is a desktop application.
Unnzip this file in a memorable place on your desktop. Check the network list to make sure the country/networks you wish to SMS are covered. Once downloaded and unzipped into a memorable place on your PC you can click on the logo to enter your username and password if you already registered.

Register online and receive 9 free test SMS.
2 important things to remember during registration:
If your country is covered, and you entered a ligitimate mobile phone number you will receive a SMS with a validation code to validate your account. If you do NOT receive a validation code, your network is not covered or you entered the wrong number format. Click on the link that says "Activate your account" after you registered to enter your username and validation code which you will receive on your mobile. Your 9 free sms will be allocated as soon as the account is validated. You will be prompted upon login to validate your account until it is validated.
When you double click on the downloaded software, the login screen would look like this:

Enter your username and password and click on login to start texting with your free pc to mobile text messaging software.