Hi Dreen. My name is NET10 Stephanie and I will be addressing your question. The units and the service days you have left on the old phone will be the same amount that will be transfered to the new phone. You can call the Customer Service Hotline at 1-877-836-2368 and ask assistance with our Technical Support Team. We are open from Mondays-Sundays from 8:00am-11:00pm EST. You can also visit the website at
www.net10.com the go to "Activate/Reactivate Phone" then click on "Transfer Number". I believe this answers your question. It's been a pleasure helping you. Have a good day.