Prefix 787-401 — Rio Piedras, PR

NANPA CO code assignment, current as of July 28, 2026.

The 787-401 prefix belongs to area code 787 and is anchored to the Rio Piedras rate center (PR). In NANP terms, the prefix — or NXX — determines the rate center a number is billed against.

Rio Piedras is part of the San Juan-Bayamón-Caguas, PR Metropolitan Statistical Area. For routing purposes it sits in LATA 820. Numbers here keep Atlantic time.

Code-holder of record: LIBERTY MOBILE PUERTO RICO INC. (OCN 639J). The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 787-401 numbers may be served by different companies.

Caller ID showing 787-401 is not proof the call came from Rio Piedras: spoofing and porting both detach numbers from their origin. To verify a caller, hang up and dial the organization's published number, and report suspicious calls to the FTC.

Neighboring prefixes

FAQ

Where is 787-401 located?

The prefix is assigned to the Rio Piedras rate center in PR, area code 787. It is part of the San Juan-Bayamón-Caguas, PR Metropolitan Statistical Area.

Which company owns 787-401 numbers?

LIBERTY MOBILE PUERTO RICO INC. holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.

Is a call from 787-401 safe to answer?

The prefix itself says nothing about the caller. Legitimate Rio Piedras businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.