In order to send texts from Voicent software you need to have an active texting plan with a GSM-based service provider. If your service provider gives you a SIM card, then they are most likely compatible. A good example is AT&T.
Once you have an active texting plan, you’ll need a GSM modem. This device connects with your computer and a SIM card, so that you can send texts right from your desktop.
With an active texting plan and a GSM modem, you’ll need to setup your GSM modem.
Setup is a simple process. Take a look at this helpful SMS setup guide for more details.