You can SIM swap AT&T (or T-Mobile) up until the time Tracfone stops it... without ever announcing the change.
Anyone with AT&T or T-Mobile service should check frequently for TF to have de-activate the phone unexpectedly, so they can then switch you to Verizon service. They want to retain you as a customer, but that will not stop them from trying to get you to buy airtime to re-activate with the Verizon service.
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