Use your compatible cell phone on the TracFone network with this TracFone SIM kit, which contains GSM and CDMA LTE three-in-one (nano/micro/regular) SIM cards and activation instructions to suit your needs.
For a buck (the same price as on-line) you can have your Tracfone BYOP card immediately - works for me!
My only warning is about the Tracfone website - after you enter the SIM card number, the following screen has a field for the phone IMEI - DO NOT enter the actual IMEI for your phone! It will be prefilled with digits from the SIM card - leave those there. (This is for a GSM phone, it may be different for CDMA.) If I understand correctly, Tracfone registers the SIM card, not the phone.