These charts indicate cellular coverage for all of the New England cellular providers. 

Green indicates that the cell company provides service in that area. Your phone should work with all available features.

Yellow indicates that the cell company does not provide service and your phone will roam.  Your particular cellular plan will determine whether you will be charged for roaming and/or long distance.

Red indicates that the cell company does not provide service, and since there are no other compatible services, your phone will not work, even for emergency calls.

Please be aware that these charts do not indicate whether you will be charged roaming in a particular area.  That fact depends on your particular service provider and your particular service plan.