When you sign up, by default your account will send out using a shared number. If you want to purchase a dedicated number, you can do that from the dashboard here: https://dashboard.clicksend.com/#/numbers/sms
When sending an SMS, we will assign a shared sender number. This allows the end user to reply. Other clients also share this 'from' number. You have to send an outgoing SMS before the user can reply.
Another option is to use a dedicated number that you purchase from ClickSend. This also allows the end user to reply. Only you own this number. You don't have to send an outgoing SMS first for a user to reply. You can advertise this number for keyword promotions etc.
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