WHMCS is considered as a must have tool for the hosting domain and server providers. WHMCS add-on allows you to send automated SMS message to your clients on defined actions, such as when they place a new order, register, password change, payment status and more. You can even receive alerts as administrator on events like when a new client is added, on new ticket and more.
Download plugin here
Version-2 change log
*Removed SMS subscribe option.
*Removed Custom gsm field.
*Messages will be sent as per user country (International Messages).
*Removed unicode and flash sms options.
*Added variables in Send SMS.