Area Code +1-787-(3990000...3999999) located in Rio Piedras, Puerto Rico (PR), more detail is as below. Place International Dialing Code : 1 International Prefix : 011 National Prefix : 1 National Destination Code : 787 Subscriber Number From : 3990000 Subscriber Number To : 3999999 National Destination Code Length : 3 Uses National Destination Code : Yes National Significant Number Length : 10 Number Type : M (Mobile, Cellular) Carrier Name : NEW CINGULAR WRLS GA Click here to buy Puerto Rico Area Code Database Other Information Language Code : es (Spanish) Country Number : 630 (Puerto Rico) Country Code : PR (Puerto Rico) Region Code : PR Region Name : Puerto Rico City : Rio Piedras Timezone : America/Puerto_Rico Coordinated Universal Time : -04:00 Daylight Saving Time : No National Significant Number Minimum Length : 10 Latitude : 18.4000 Longitude : -66.0500 ‹ previous : +1-787-(3980000...3989999) next › : +1-787-(4000000...4000999) Dialling Instructions For trunk calls: 1 787 3990000 (Trunk Code + National Destination Code + Subscriber Number) For international calls: 011 1 787 3990000 (International Prefix + International Dailing Code +National Destination Code + Subscriber Number) Telephone Number List 3990000 ~ 3999999 (Count: 10,000) Example: +1-787-3990000 / 0111-787-3990000 (1787-3990000 / 1-787-3990000) +1-787-3990001 / 0111-787-3990001 (1787-3990001 / 1-787-3990001) +1-787-3990002 / 0111-787-3990002 (1787-3990002 / 1-787-3990002) +1-787-3990003 / 0111-787-3990003 (1787-3990003 / 1-787-3990003) +1-787-3990004 / 0111-787-3990004 (1787-3990004 / 1-787-3990004) ...+1-787-xxxxxxx / 0111-787-xxxxxxx (1787-xxxxxxx / 1-787-xxxxxxx) ...+1-787-3999995 / 0111-787-3999995 (1787-3999995 / 1-787-3999995) +1-787-3999996 / 0111-787-3999996 (1787-3999996 / 1-787-3999996) +1-787-3999997 / 0111-787-3999997 (1787-3999997 / 1-787-3999997) +1-787-3999998 / 0111-787-3999998 (1787-3999998 / 1-787-3999998) +1-787-3999999 / 0111-787-3999999 (1787-3999999 / 1-787-3999999)