Within US and Canada, you cannot use your phone number as Caller ID for text messages. You'll have to rent a number from us.
Outside US and Canada, you can use any validated phone number as the caller ID. When you use a validated number as a caller ID, all replies will come back to that number.
You will need to rent a number only when you want replies to come back into your account. When replies come back into your account, the software can do additional things like,
- Measure campaign effectiveness by automatic classification of messages
- Send automatic responses based on keywords in the replies
- Handle opt out responses by removing the contact from future SMS campaigns