NumberResearchThousands-blocks in 307-441
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 307-441 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 307 blocks
Most active assignees, all time — NPA 307
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2013-10-23 | 307-441-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | CASPER | WY |
| 2012-09-24 | 307-441-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | CASPER | WY |
| 2021-10-25 | 307-441-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | CASPER | WY |
| 2023-07-13 | 307-441-3XXX | 3000–3999 | Assigned | ONVOY, LLC - WY | 450F | CASPER | WY |
| 2012-09-24 | 307-441-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY | 6566 | CASPER | WY |
| 2023-07-13 | 307-441-5XXX | 5000–5999 | Assigned | ONVOY, LLC - WY | 450F | CASPER | WY |
| 2013-02-22 | 307-441-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA WY-LLC | 879G | CASPER | WY |
| 2022-03-09 | 307-441-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CASPER | WY |
| 2022-03-09 | 307-441-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CASPER | WY |
| 2023-07-13 | 307-441-9XXX | 9000–9999 | Assigned | ONVOY, LLC - WY | 450F | CASPER | WY |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.