Contribution by Hans Tobias Sopu
email tobias.sopu@gmail.com
https://github.com/kumaunix/

This sms can show online and offline users, it has notifications.
users can exchange text messages, pictures and pdfs as SMS.

--Important !! Please read before create the user name also
Your session usage in this system $_SESSION['id'] = id as auto_increment in the users table
$_SESSION['user'] refers to the role of the users in the system, users, admin, manager, etc.
$_SESSION['lname'] refers to the last name and $_SESSION['fname'] refers to first name of the user. If you have a different variable name please 
change the above sessions to yours inorder for the proper names of the users to display.