8 things to know about 10-digit dialing, which began Saturday in Lancaster County | Local News | lancasteronline.com
New 835 area code coming to the Philadelphia area
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New 223 area code expands 10-digit dialing in Berks | Berks Regional News | wfmz.com
Area Code Overlay Approved for the Pennsylvania 717 Area Code
Area codes 304 and 681 - Wikipedia
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Area code 412 - Wikipedia
List of country calling codes - Wikipedia
All US area codes by state | Freshdesk Contact Center (Formerly Freshcaller)
Why phone numbers start with "0"?
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Time to start dialing 10-digit phone numbers
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223 comes to the 717 area code: Here's everything you need to know - pennlive.com
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223 Area Code - Location map, time zone, and phone lookup
223 Area Code - Location map, time zone, and phone lookup
681 Area Code - Location map, time zone, and phone lookup
