Quick answer: Yes. A phone number purchased from GreatNumber can be used with almost any US carrier — T-Mobile, AT&T, Verizon, Mint, Cricket, Metro, Visible, Boost, Google Fi, Ultra Mobile, and VoIP services like Google Voice. You simply submit a standard port-in request to your carrier with the three credentials provided after purchase (Account Number, Transfer PIN, Billing ZIP). Ports normally complete in 1–24 hours.
How it works: a port-in, not a new line
US carriers are required by FCC rules to accept incoming numbers when the subscriber provides matching credentials. Buying a number and moving it to your carrier is mechanically identical to keeping your old number when you switch carriers — the industry processes millions of these ports every year.
Two ways to use your new number
Option A: add a line to your existing account
Ask your carrier to add a line, choose "bring my own number," and enter the credentials. Your existing number and plan are untouched; the new number arrives as a second line.
Option B: replace your current number
Port the purchased number onto your existing line. Note: your old number is released in this process — port it somewhere first (e.g., Google Voice, $20) if you want to keep it as a backup.
Carrier-by-carrier notes (2026)
- T-Mobile / Verizon / Mint: fastest, typically 1–12 hours; can be done in the app.
- AT&T / Cricket: 2–24 hours; in-store is smoothest.
- Google Fi / Visible: app-driven, usually same day.
- Google Voice: 1–3 days, $20 one-time fee — and one-way (you cannot port back out to a mobile carrier later).
- Toll-free numbers (800/888/877…): port to VoIP/business phone platforms, not personal mobile SIMs.
What you'll need
- Account Number — identifies the number's current home
- Transfer PIN — valid 2 weeks; regenerate free anytime in the User Center
- Billing ZIP — must be entered exactly as provided
GreatNumber delivers all three within 24 hours of purchase. Step-by-step instructions with bilingual carrier scripts: porting guide.
If a port gets rejected
80% of rejections are an expired PIN (regenerate it — free, instant) or an address typo (copy the ZIP exactly). The rest resolve by removing hyphens from the account number or retrying after an hour. Stuck? Support responds within an hour, or walk into any of our 9 stores in CA/NV for free hands-on help.
