San Jose, California

Area code 408 phone validation

Calling or texting a list of 408 numbers? Check every number first: valid or dead, mobile, landline or VoIP, and the carrier it is on now.

Start 7-day free trial →
Location
San Jose, California
United States
Time zone
Pacific Time (PT)
Prefixes in use
787
NANPA utilized-codes report

What validating 408 numbers tells you

  • ✓Valid or dead. Disconnected and unassigned 408 numbers are flagged before your dialer or SMS tool reaches them.
  • ✓Mobile, landline or VoIP. Know which numbers can take a text and which are desk phones or app numbers.
  • ✓Carrier. The carrier each number is on now, which can differ from the company that was first given the prefix because numbers are ported.

Who holds 408 prefixes

Companies holding the most 408 prefixes (NPA-NXX blocks) in the NANPA utilized-codes report. This is who was assigned the number blocks, not who serves each number today: a number can be ported to any carrier, which is why a live check matters.

Pacific Bell328 prefixes
New Cingular Wireless Pcs70 prefixes
Verizon Wireless65 prefixes
Mcimetro Access Transmission Services48 prefixes
T-Mobile Usa42 prefixes
Onvoy35 prefixes

122 of 787 408 prefixes are held by companies that commonly supply numbers to VoIP and texting apps.

Places served by 408

Snjs West, Snjs North, Sunnyvale, Snjs South, Campbell, Los Gatos, Morganhill, Gilroy.

Clean your list in 30 seconds

Upload your 408 list as CSV or Excel. Every number comes back marked valid or dead, mobile, landline or VoIP, with carrier.

Start 7-day free trial →Free carrier lookup

Starter: $97/month for 5,000 numbers after the 7-day trial. Cancel anytime.

Questions

Where is area code 408?

408 serves San Jose, California, including places such as Snjs North, Sunnyvale, Snjs South. Time zone: Pacific Time (PT).

Which area codes overlap with 408?

669 serves the same area. A list for this area will usually mix these codes, and TrueSearch checks them all the same way.

Does a 408 number mean the person is in California?

Not always. People keep their numbers when they move or switch carriers, and VoIP numbers can be assigned anywhere. The area code tells you where the number was first assigned, not where the person is today.

What does validating a 408 number tell me?

Whether the number is valid or dead, whether it is a mobile, landline or VoIP line, and the carrier it is on now, from live carrier data.

Does TrueSearch check Do Not Call lists?

No. TrueSearch does not check the National Do Not Call Registry, state DNC lists or litigator lists yet. Run those checks separately where they apply.

408 prefix pages

408-200408-202408-203408-223408-340

More California area codes

669 phone validation209 phone validation213 phone validation279 phone validation310 phone validation323 phone validation341 phone validation350 phone validation415 phone validation424 phone validation442 phone validation510 phone validation530 phone validation559 phone validation562 phone validation619 phone validation626 phone validation628 phone validation650 phone validation657 phone validation661 phone validation

Area code 408 reference: places, prefixes and local time

This guide is general information, not legal advice. TrueSearch for Business checks validity, line type and carrier from licensed telecom data. It does not check the National Do Not Call Registry, state DNC lists or the FCC Reassigned Numbers Database. Not a consumer reporting agency; not for FCRA purposes.