Do I need to turn off Voice And Data Roaming On My iPhone 5 When I Am In The USA And NOT Travelling?

Do I need to turn off Voice And Data Roaming on my iPhone 5 if I am NOT traveling  and I am in the USA?
Also can it stay on if I am traveling just through the USA and not getting near any Borders of the Country?
Thanks in advance.

wifi is not something you can be charged for

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