Canadial Know Who Called

(650) 235-9577

San Mateo, CA

Low risk

(650) 235-9577 has 2 FTC complaints, mostly about medical and prescription offers.

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2
FTC complaints
0
Community reports
Sep 21, 2023
Latest report

Complaint history

2 FTC complaints on Sep 21, 2023.

Both FTC complaints are about calls in Sep 2023.

FTC complaints are filed by consumers with the U.S. Federal Trade Commission's Do Not Call registry; they aren't verified by the FTC or by us.

What callers claimed

2 of its 2 FTC complaints (100%) are about medical and prescription offers, against 4% of the 26,373 FTC complaints about all numbers in area code 650.

Complaint categories chosen by FTC complainants:

  • Medical & prescriptions 2 · 100%

Who called

The number's block is assigned to AT&T Enterprises, LLC in San Mateo, CA.

Is it a debt collector?

Nothing says it is: none of its 2 complaints describe debt collection.

Nearby numbers in 650-235

21 numbers in 650-235 have 24 FTC complaints between them (75% robocalls), 2 of them about (650) 235-9577. The commonest categories in the block: Medical & prescriptions (17%), Reducing your debt (credit cards, mortgage, student loans) (13%).

The closest reported numbers on either side of (650) 235-9577, in number order.

All reported numbers in 650-235 →

When the calls came

Time of day of 2 calls; most often the 8 a.m. hour (2):

12a 6a 12p 6p

Day of the week of 2 calls; most often Thursday (2):

Sun Mon Tue Wed Thu Fri Sat

The date and time of the call as complainants entered them on the FTC form; the time zone isn't recorded. Times entered as exactly midnight or noon are left out (they're usually the form's default).

Location

Location of the number block
San Mateo, CA, USA
Block assigned to
AT&T Enterprises, LLC

From the North American Numbering Plan Administrator (Nov 3, 2026). This is who the number block was assigned to; numbers can be moved between carriers, and caller IDs can be faked.

Both FTC complainants were in California. Statewide, California ranks #26 of the 50 states and DC for Do Not Call complaints per resident: 283,769 in the last 12 months, 721 per 100,000 people. Spam calls in California.

Where FTC complainants were located (U.S. states):

  • California 2 · 100%

Area code 650: where it is, time zone, spam calls →

Searches on Canadial

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Answers from visitors, one per person per month (asked at the top of the page).

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Recent community reports

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What to do

Questions about (650) 235-9577

Who called me from (650) 235-9577?
No complaint names the caller; FTC complainants most often said the calls were about medical and prescription offers. The number is in a block assigned to AT&T Enterprises, LLC in San Mateo, CA (NANPA, Nov 3, 2026); numbers can move between carriers, so the caller's provider may differ.
Is (650) 235-9577 a scam?
Canadial rates it low risk, from 2 complaints, latest Sep 21, 2023.
Is (650) 235-9577 a debt collector or collection agency?
Nothing says it is: none of its 2 complaints describe debt collection.
Should I call (650) 235-9577 back?
Be careful. If you don't recognize it, let it go to voicemail: a legitimate caller will leave a message, and you can reach any real organization on a number you look up yourself.
How many times has (650) 235-9577 been reported?
2 complaints to the U.S. FTC's Do Not Call registry on Sep 21, 2023.
What do callers from (650) 235-9577 say?
2 of its 2 FTC complaints (100%) are about medical and prescription offers, against 4% of the 26,373 FTC complaints about all numbers in area code 650.
When does (650) 235-9577 call?
In FTC complaints, the most common time was the 8 a.m. hour (2 of 2 calls with a time); the most common day was Thursday (2 of 2).

Data updated: FTC complaints through Nov 13, 2026; numbering records as of Nov 3, 2026; community reports live. How this page is built.