Your phone number is tied to your sim card not the phone.
Hey kerryg1! Congrats on deciding to upgrade! Gramps28 is absolutely right - you can upgrade your existing line and simply move your SIM over to start using your number on the new phone, or activate a new SIM on your line - either way, your phone number doesn't have to change. Please let us know if we can help with any more questions about upgrading - we're happy to assist if you need us!