Can I send messages from my own mobile number?
Yes you can (depending on the country). Replies will bypass our system and will be sent to your mobile as an SMS. This means the replies won't show on the ClickSend dashboard and you can't setup rules on what to do with the inbound messages.
If you want replies to show on the ClickSend dashboard and be able to setup rules on what to do with inbound messages, you can either use our free shared numbers as the sender, or purchase a dedicated ClickSend number.
Here's some more info: https://help.clicksend.com/SMS/what-is-a-sender-id-or-sender-number?