Glendale, Arizona
Area code 623 phone validation
Calling or texting a list of 623 numbers? Check every number first: valid or dead, mobile, landline or VoIP, and the carrier it is on now.
Start 7-day free trial →What validating 623 numbers tells you
- ✓Valid or dead. Disconnected and unassigned 623 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 623 prefixes
Companies holding the most 623 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.
| Qwest | 97 prefixes |
| T-Mobile Usa | 39 prefixes |
| Verizon Wireless | 31 prefixes |
| Onvoy | 29 prefixes |
| New Cingular Wireless Pcs | 22 prefixes |
| Mcimetro Access Transmission Services | 13 prefixes |
69 of 313 623 prefixes are held by companies that commonly supply numbers to VoIP and texting apps.
Places served by 623
Phoenix.
Upload your 623 list as CSV or Excel. Every number comes back marked valid or dead, mobile, landline or VoIP, with carrier.
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Questions
Where is area code 623?
623 serves Glendale, Arizona. Time zone: Mountain Time, no daylight saving (MST).
Does a 623 number mean the person is in Arizona?
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 623 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.
623 prefix pages
More Arizona area codes
Area code 623 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.