You’ve posted your inquiry to Republic’s Community, which is a public forum. to protect your privacy, I would ask you to delete your phone number.
Activating your new phone is a self-serve operation. When ready, you’ll start the activation process. Republic offers a great walkthrough here: Activate | Republic Wireless. You will be prompted to sign into the appropriate Republic account. To upgrade an existing line to a new phone, select “replace existing line”. You should see the phone number you want to replace listed at this step. Continue through the activation process, then you’re all set! Detailed activation guidance here: Activate My Phone.