MAC Bulk SMS Software for USB Modems Screenshots Connect your USB modems with software via MAC machine. Select com port from connected device list. Click on 'Use Selected Device to Send SMS' button to continue. Import phone numbers file and add text messages. Software has various advanced features such as delayed delivery option, exclusion list wizard option, send unicode messages, save sent items, skip duplicate numbers etc. Click on 'Send' button to send bulk SMS. SMS sending process is going on. You can view current running status of SMS sending process.