If you're concerned about someone else accessing your new phone number, there are a few steps you can take to protect yourself. First, choose a carrier that offers additional security features like password protection or two-step verification. You can also set up a PIN code for your account and enable call forwarding to another number if someone tries to call your new phone number. Finally, be sure to keep your personal information (including your new phone number) confidential and only share it with people you trust.