Are you planning on traveling outside the US?
The phones will connect only to available, approved networks based on what is available to your Trac phone. In the US, you will not likely see any indication that it is roaming. More likely there is coverage or no coverage and as simple as that. If there is an issue for them if you are roaming off network by a large enough percentage, you will be notified, typically being shut down until you contact customer service.
On domestic usage in the US, such roaming problems are very rare today.
Just another day in paradise.....
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