In order to have two-way communication between you and your customers, you need to include your virtual number inside the message you sent to your customers. So that customers will have the ability to contact you and SMS you back through your included virtual number in the message.
You can buy your virtual number in section virtual number inside your SMS dashboard. You may have a look at our prices here.
Note: your customer still needs to pay the international sending charges when they send you back a message.
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