Area code 939 serves Puerto Rico. Atlantic Time. In service since September 2001 as an overlay of 787.
Puerto Rico
Area code 939 · Atlantic Time
The country on this page rides every phone parse. Send any number and it comes back with validity and clean formats.
curl -s "https://api.parseapi.com/phone/9395550100" \ -H "X-Api-Key: $PARSEAPI_KEY"