Prefix 909-442 — Rialto, CA
Numbers in the 909-442 prefix are registered to the Rialto rate center in CA, inside area code 909. The prefix is the second block of a ten-digit US number (909-442-XXXX) and pins the number to a billing locality.
NANPA's central-office code records list T-MOBILE USA, INC. (OCN 6529) as the code holder, assigned November 2, 2016. Because 909-442 participates in thousands-block pooling, individual 1,000-number blocks may belong to other carriers than the code holder.
The rate center lies in the Riverside-San Bernardino-Ontario, CA Metropolitan Statistical Area. The serving LATA is 730. Local time follows the Pacific zone.
Spoofing means this prefix on your screen doesn't guarantee a Rialto caller. Verify independently before trusting a request for money or data.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 909-439 | Colton | PACIFIC BELL |
| 909-440 | Rialto | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA |
| 909-441 | Fontana | T-MOBILE USA, INC. |
| 909-443 | Ontario | ONVOY, LLC - CA |
| 909-444 | Diamond Bar | FRONTIER CALIFORNIA INC. |
| 909-445 | Claremont | FRONTIER CALIFORNIA INC. |
FAQ
Where is 909-442 located?
The prefix is assigned to the Rialto rate center in CA, area code 909. It is part of the Riverside-San Bernardino-Ontario, CA Metropolitan Statistical Area.
Which company owns 909-442 numbers?
T-MOBILE USA, 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 909-442 safe to answer?
The prefix itself says nothing about the caller. Legitimate Rialto businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.