The Voicent Gateway has a setting that will auto-detect the COM port being used by your USB modem for BroadcastBySMS. To find this setting, you will need to open up the Voicent Gateway, go to “Options” then go to the SMS tab. Select “Auto detect” and then restart the Gateway. If you see an SMS line started then your modem is connected to the Gateway.

Hi. I purchased Zoom modem model 4598. I bought it to work with Voicent BroadcastbyText through my T-Mobile SIM card. I tried it and it is not working, but it works if I use my AT-T SIM card. I thought it was because of the defected SIM card, but I replaced it twice at the T-Mobile store and still gave the same result. Help?

Zoom 4598 modem only supports frequency band of 850, 1900, and 2100MHz, while T-Mobile sends out data through frequency bands of 1700 and 2100 MHz. However, T-Mobile GSM card will still work depending on your location. If the location of your SIM card is near a cell tower that sends out 2100MHz, then you should be fine. But if you’re unlucky, there’s a chance that your T-Mobile card would not work as your location might be sending data through 1700MHz frequency band.

This information also holds true for AT-T 4G LTE technology. 4G LTE sends data through 700, 1700, and 2100MHz frequency band. Although, AT-T’s 2G and 3G GSM cards all well supported by Zoom 4598

Whatever card you have or location you are in, you should purchase a mobile broadband modem that supports the frequency bands that you are using. Hope this helps