Bulk voice call or voice broadcasting is the process of sending pre-recorded voice messages to a large group of recipients simultaneously. It is possible to use a USB 3G data card or dongle to send bulk voice calls using a computer or laptop.

• Choose a voice broadcasting software that is compatible with a USB 3G data card or dongle. There are many software solutions available that can be used to create and send voice messages to multiple recipients, such as CallHub, DialMyCalls, and VoiceShot.
• Insert the USB 3G data card or dongle into a USB port on your computer or laptop. Make sure the device is recognized by the computer and has a strong network signal.
• Sign up for the software and create your message. Record your message or use a text-to-speech feature to create the message. You can also customize the message by adding the recipient's name, location, or other personalized information.
• Upload your contact list to the software. The contact list should include the phone numbers of the recipients you want to send the message to.
• Schedule the message to be sent at a specific time and date. You can also choose to send the message immediately.
• When the message is sent, the software will dial the phone numbers on the contact list and play the pre-recorded message through the USB 3G data card or dongle.