Yes. On your Tracfone, open it up and check out the insides.If it has a sim, it is gsm. If it doesn't have a sim card, it is cdma. Tdma was phased out in the last few years and I don't think anyone uses it anymore in the US. Iden is only for Nextel/Boost, Southern Linc and a few other companies which has the famous Nextel type Push To Talk walkie talkie trunked radio feature. Most of the world uses gsm with a good sized minority using cdma.