Why buy from Tracfone at all if you want ATT service?
For details like the VM app and WiFi calling, best to get a device branded by ATT or from its captive / MVNOs
Even unlocked may not get you that level of compatibility until you get up above $500+ level devices.
Tracfone devices are all VZW-centered now, notoriously anti-competitive, and just because the model is whitelisted on ATT does not mean you get optimal service there.
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