Within the US, Canada, Australia, and the United Kingdom, you cannot use your phone number as a Caller ID for sending messages in SMS campaigns.
You'll have to rent a number from us.
However, for the rest of the countries, you can use any validated phone number as the caller ID. When you use a validated number as a caller ID, all replies will return to that number.
You only need to rent a number 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