855 is a toll-free code. The caller pays nothing, anywhere in the North American Numbering Plan. In service since October 2010.
Toll-free
Area code 855 · Works across the North American Numbering Plan
Send any number and the line type comes back with validity and clean formats. A toll-free or service number is called out by type.
curl -s "https://api.parseapi.com/phone/8555550100" \ -H "X-Api-Key: $PARSEAPI_KEY"