ICC 309 Area Code Overlay
An overlay is the addition of another area code (447) to the same geographic region as an existing area code (217) in the Springfield area.
An overlay is the addition of another area code (447) to the same geographic region as an existing area code (217) in the Springfield area.
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An overlay is the addition of another area code (447) to the same geographic region as an existing area code (217) in the Springfield area.