A:Answer Hi. This is Frank from TracFone Wireless. You cannot use the SIM card from the other service provider, however, you can transfer the phone number to the new phone as long as it is active. You can also buy our 30 day plan in order to have a phone for 30 days. Should you have further questions or concerns, please copy this link http://bit.ly/2qdrKHH and paste it on a new window to chat with us. You may also text HELP to 611611. For your convenience, our representatives are available Monday-Sunday from 8:00 AM to 11:45 PM EST. Thank you.