Find out who called from that unknown San Mateo number using our free reverse phone lookup service. Enter the full 10-digit number (including 650 or any other US area code) to search for available caller information including name, address, phone carrier, and more.
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San Mateo area codes are 650.
Phone numbers reported as unwanted calls to the FTC by San Mateo residents in the last 30 days.
(415) 604-1043
Other
1 report ·
(415) 857-5442
Other
1 report ·
(833) 854-2927
Other
1 report ·
(415) 481-7750
Other
1 report ·
(877) 928-9602
Other
1 report ·
(628) 241-2345
Other
1 report ·
(747) 389-1976
Other
1 report ·
(516) 244-2635
Other
1 report ·
(833) 579-9795
Reducing your debt (credit cards, mortgage, student loans)
1 report ·
(833) 491-3898
Calls pretending to be government, businesses, or family and friends
1 report ·
If you receive fraudulent calls or suspect a scam attempt, report it to reportfraud.ftc.gov or local police department using the following contacts:
List of prefixes are assigned to SAN MATEO rate center. Filter by phone number prefix or carrier name.
| Prefix | Carrier |
|---|---|
| (650) 200 | O1 Communications |
| (650) 212 | AT&T |
| (650) 218 | T-Mobile |
| (650) 222 | T-Mobile |
| (650) 227 | Verizon |
| (650) 235 | Verizon |
| (650) 240 | Onvoy |
| (650) 242 | Lumen |
| (650) 245 | AT&T |
| (650) 274 | T-Mobile |
| (650) 281 | T-Mobile |
| (650) 286 | AT&T |
| (650) 287 | AT&T |
| (650) 288 | Lumen |
| (650) 292 | Lumen |
| (650) 293 | AT&T |
| (650) 294 | AT&T |
| (650) 312 | AT&T |
| (650) 315 | T-Mobile |
| (650) 340 | AT&T |
| (650) 341 | AT&T |
| (650) 342 | AT&T |
| (650) 343 | AT&T |
| (650) 344 | AT&T |
| (650) 345 | AT&T |
| (650) 346 | T-Mobile |
| (650) 347 | AT&T |
| (650) 348 | AT&T |
| (650) 349 | AT&T |
| (650) 350 | AT&T |
| (650) 356 | AT&T |
| (650) 357 | AT&T |
| (650) 358 | AT&T |
| (650) 371 | USA Mobility Wireless |
| (650) 372 | AT&T |
| (650) 373 | AT&T |
| (650) 375 | AT&T |
| (650) 376 | Global Crossing Local Services |
| (650) 377 | AT&T |
| (650) 378 | AT&T |
| (650) 389 | Verizon |
| (650) 393 | Lumen |
| (650) 401 | AT&T |
| (650) 403 | Verizon |
| (650) 408 | American Messaging Services |
| (650) 425 | Verizon |
| (650) 430 | T-Mobile |
| (650) 431 | T-Mobile |
| (650) 432 | AT&T |
| (650) 435 | Verizon |
| (650) 436 | AT&T |
| (650) 437 | Bandwidth |
| (650) 445 | T-Mobile |
| (650) 458 | Astound Broadband |
| (650) 477 | Verizon |
| (650) 483 | AT&T |
| (650) 504 | AT&T |
| (650) 513 | AT&T |
| (650) 520 | T-Mobile |
| (650) 522 | AT&T |
| (650) 523 | Onvoy |
| (650) 524 | AT&T |
| (650) 525 | AT&T |
| (650) 532 | TPX Communications |
| (650) 533 | T-Mobile |
| (650) 539 | T-Mobile |
| (650) 544 | T-Mobile |
| (650) 548 | AT&T |
| (650) 554 | AT&T |
| (650) 558 | AT&T |
| (650) 570 | AT&T |
| (650) 571 | AT&T |
| (650) 572 | AT&T |
| (650) 573 | AT&T |
| (650) 574 | AT&T |
| (650) 576 | AT&T |
| (650) 577 | AT&T |
| (650) 578 | AT&T |
| (650) 579 | AT&T |
| (650) 581 | Teleport Communications America |
| (650) 619 | AT&T |
| (650) 627 | AT&T |
| (650) 638 | AT&T |
| (650) 642 | T-Mobile |
| (650) 645 | Teleport Communications America |
| (650) 653 | Mcimetro Access Transmission Services |
| (650) 655 | AT&T |
| (650) 678 | Verizon |
| (650) 685 | AT&T |
| (650) 696 | AT&T |
| (650) 703 | AT&T |
| (650) 727 | Bandwidth |
| (650) 740 | AT&T |
| (650) 753 | T-Mobile |
| (650) 759 | Verizon |
| (650) 762 | AT&T |
| (650) 766 | AT&T |
| (650) 773 | Verizon |
| (650) 787 | AT&T |
| (650) 863 | AT&T |
| (650) 867 | AT&T |
| (650) 888 | AT&T |
| (650) 918 | AT&T |
| (650) 921 | T-Mobile |
| (650) 931 | TPX Communications |
| (650) 954 | T-Mobile |
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.