With the Free version you can create up to 5 SMS templates (one template for one contact and a message).
If you like this application and want to have more features, buy rfwSMS Pro version where you can set 20 SMS templates, remove the signature on the application, remove the advertising and others.
The Pro version can be used to configure GPS trackers (locators), and other devices/programmers that are configured for SMSs.
WARNING: costs may apply please check your tariff and, in this version, each sent message is added to the application signature. With the dual sim devices I do not know its behavior. If someone could test it and feedback me I would be thankful.