When you are using multiple numbers under one account, we have a few features to keep your conversations organized and to help you reply to a contact from the correct phone number.
When you are sending a message to a contact, you may want to send your message from the same phone number they last received a message from to avoid confusing the contact.
In the message box, you can switch which number you want to send your message FROM by clicking the drop down arrow on the bottom right corner:
Next, you can toggle "on" the number you want to send your message from:
If the number you are sending from is different from the last # they received a message from, a message will pop up notifying you that it is different,. It will let you know which number they received the last message from, and it will prompt you to choose to "cancel" so you can change your from number to be from the same phone number they received the last message from, or you can choose to “send anyway”.
To proceed with "send anyway", means a new conversation thread might be created with that person.
By default, your main, primary number will be the number chosen to send your messages from. The number you have been assigned to is your main, primary number.