Good day, sandy. My name is Jessica Net and I'll be addressing your question. Unfortunately, inserting your NET10 SIM card to Straight Talk won't port your phone number over. It'll be rejected instead since SIM card is only associated with your NET10 phone. We really need to follow the port process for the phone number to transfer over to Straight Talk. I believe this answers your question. It's been a pleasure helping you. Have a good day.