Who is calling from 303?

Places served by 303

NANPA rate centers in 303, ranked by how many phone prefixes each holds.

Who holds 303 numbers

784 prefixes (303-XXX) are assigned. Carriers holding the most:

About 13% of 303 prefixes are held by wholesale carriers that commonly supply numbers to VoIP and texting apps (such as Google Voice or TextNow). A number from one of those blocks may not belong to a traditional phone line. What a VoIP number means.

Got a call or text from a 303 number?

1. Don't call back until you know who it is. Scam calls often use local-looking numbers, and caller ID can be spoofed (FCC).
2. Type the full number above. Carrier, line type and city are shown before anything is charged.
3. If it is someone you met on a dating app, see reverse phone lookup for dating.
4. Recognize the common scripts: fake bank alerts, unpaid toll texts, fake government agents, one-ring calls. All current phone scams.
5. Report scam calls at ReportFraud.ftc.gov and add your number to the National Do Not Call Registry.

Same area, other codes

Other Colorado area codes · see all

Questions about 303

All 303 prefixes (784)